How do you type Greek letters on a Mac without switching keyboards?

On standard macOS US keyboards, several Greek letters have built-in Option shortcuts: Option + p produces π, Option + m produces μ, Option + w produces Σ, Option + z produces Ω, Option + j produces Δ, and Option + s produces ß (German sharp S). To type all 24 Greek letters, press Control + Command + Space to open the Character Viewer, or add 'Greek' in System Settings > Keyboard > Text Input > Input Sources.

What are the HTML entities for Greek symbols?

HTML named entities follow a simple formula: α (α), Α (Α), β (β), γ (γ), Γ (Γ), δ (δ), Δ (Δ), θ (θ), Θ (Θ), λ (λ), Λ (Λ), μ (μ), π (π), Π (Π), σ (σ), Σ (Σ), ω (ω), and Ω (Ω).

Greek Symbols (α, β, γ, π, θ, Ω, Δ, μ): Copy & Paste Greek Alphabet, Alt Codes & Science Guide

Q: What is the Alt code for Pi (π) on Windows?

The classic Windows Alt code for lowercase Pi (π) is Alt + 227 (or Alt + 960) on the physical numeric keypad. In Microsoft Word, type 03C0 and press Alt + X.

Q: What is the Alt code for the degree / Theta symbol (θ)?

The Windows Alt code for lowercase Theta (θ) is Alt + 233 (or Alt + 952). For uppercase Theta (Θ), use Alt + 920. In Microsoft Word, type 03B8 followed by Alt + X.

Q: What are the 24 letters of the Greek alphabet in order?

The 24 Greek letters in classical order are: 1. Alpha (Α, α), 2. Beta (Β, β), 3. Gamma (Γ, γ), 4. Delta (Δ, δ), 5. Epsilon (Ε, ε), 6. Zeta (Ζ, ζ), 7. Eta (Η, η), 8. Theta (Θ, θ), 9. Iota (Ι, ι), 10. Kappa (Κ, κ), 11. Lambda (Λ, λ), 12. Mu (Μ, μ), 13. Nu (Ν, ν), 14. Xi (Ξ, ξ), 15. Omicron (Ο, ο), 16. Pi (Π, π), 17. Rho (Ρ, ρ), 18. Sigma (Σ, σ, ς), 19. Tau (Τ, τ), 20. Upsilon (Υ, υ), 21. Phi (Φ, φ), 22. Chi (Χ, χ), 23. Psi (Ψ, ψ), 24. Omega (Ω, ω).

Q: How are Greek letters written in LaTeX math mode?

In LaTeX math mode ($...$), lowercase Greek letters are typed with a backslash followed by the lowercase name: \alpha, \beta, \gamma, \delta, \epsilon, \theta, \lambda, \mu, \pi, \sigma, \omega. For uppercase Greek letters, capitalize the first letter: \Gamma, \Delta, \Theta, \Lambda, \Xi, \Pi, \Sigma, \Phi, \Psi, \Omega.

GREEK ALPHABET & SCIENTIFIC FOUNDATIONS

The Greek Alphabet: Origins, Linguistic Evolution, and Role in Modern Science

The Greek alphabet—spanning 24 classical letters from Alpha (Α, α) to Omega (Ω, ω)—is the foundational symbolic bedrock of modern mathematics, physics, engineering, astronomy, statistics, and computer science. From Archimedes' geometric ratio (π) and Einstein's cosmological constant (Λ) to quantum mechanical wave functions (Ψ), standard deviation (σ), and electrical resistance (Ω), Greek symbols provide the universal mathematical notation that powers global scientific discovery.

Developed in the early 8th century BCE from the Phoenician abjad, the ancient Greek alphabet was the first writing system in human history to assign distinct, explicit letters to both consonants and vowels. This monumental phonetic innovation enabled unprecedented precision in recording philosophical discourse, geometric proofs, and celestial observations by Hellenistic scholars such as Euclid, Pythagoras, Archimedes, Aristotle, and Eratosthenes. When the Renaissance ignited modern empirical science, pioneers including Isaac Newton, Leonhard Euler, Joseph-Louis Lagrange, and Carl Friedrich Gauss adopted Greek letters as standardized shorthand for physical constants, geometric angles, calculus differentials, and algebraic functions.

In modern computing and typography, Greek characters are officially standardized in the Unicode Standard within the Greek and Coptic block (U+0370 to U+03FF) and the Mathematical Alphanumeric Symbols block (U+1D400 to U+1D7FF). Whether typesetting equations in LaTeX, composing physics papers in Microsoft Word, writing code in Python and Julia, or formatting engineering spreadsheets, knowing how to type and copy exact Greek glyphs with their verified Alt codes and shortcuts is an essential technical skill.

THE 24 GREEK LETTERS IN ORDER

The Complete Greek Alphabet: 24 Letters from Alpha to Omega

Below is the comprehensive order of the 24 letters of the classical Greek alphabet, listing both uppercase (majuscule) and lowercase (minuscule) forms, English phonetic equivalents, and classical vs. modern pronunciations:

No.	Uppercase	Lowercase	Greek Name	English Name	Phonetic Sound	Primary Science & Math Applications
1	Α	α	Άλφα	Alpha	/æ/ or /ɑː/	Angular acceleration, significance level (p-value), fine-structure constant (1/137), thermal expansion.
2	Β	β	Βήτα	Beta	/b/ or /v/	Beta radiation, regression coefficient in econometrics, transistor gain (hFE), beta function B(x,y).
3	Γ	γ	Γάμμα	Gamma	/g/ or /ɣ/	Lorentz factor (1/√(1-v²/c²)), photon / gamma radiation, heat capacity ratio, Euler-Mascheroni constant.
4	Δ	δ	Δέλτα	Delta	/d/ or /ð/	Difference/change (Δx), Dirac delta function δ(x), Kronecker delta δij, discriminant (b²-4ac), Laplace operator.
5	Ε	ε	Έψιλον	Epsilon	/e/	Permittivity of vacuum (ε₀), infinitesimal limits (ε-δ proofs), mechanical strain, dual numbers.
6	Ζ	ζ	Ζήτα	Zeta	/z/ or /dz/	Riemann zeta function ζ(s), damping ratio in mechanical vibrations, zeta potential in chemistry.
7	Η	η	Ήτα	Eta	/eɪ/ or /iː/	Thermodynamic Carnot efficiency, dynamic viscosity (Pa·s), Minkowski spacetime metric tensor.
8	Θ	θ	Θήτα	Theta	/θ/ (th)	Plane angles in trigonometry, potential temperature, Big-Theta algorithmic complexity Θ(n), Debye temperature.
9	Ι	ι	Ιώτα	Iota	/aɪ/ or /iː/	Inclusion map in topology, unit vector, infinitesimal quantity, index generator in APL.
10	Κ	κ	Κάππα	Kappa	/k/	Geometric curvature, dielectric constant, thermal conductivity, Cohen's kappa agreement.
11	Λ	λ	Λάμδα	Lambda	/l/	Wavelength (λ = c/f), eigenvalues in linear algebra, radioactive decay constant, lambda calculus in CS.
12	Μ	μ	Μι	Mu	/m/	Micro prefix (10⁻⁶), population mean in statistics, coefficient of friction, magnetic permeability (μ₀).
13	Ν	ν	Νι	Nu	/n/	Wave frequency (v = c/λ), kinematic viscosity, neutrino in particle physics, degrees of freedom.
14	Ξ	ξ	Ξι	Xi	/ks/ or /z/	Dimensionless spatial variable, partition function in statistical mechanics, Riemann cascade Xi function.
15	Ο	ο	Όμικρον	Omicron	/oʊ/ or /ɒ/	Little-o asymptotic complexity o(n), fifteenth letter of Greek alphabet.
16	Π	π	Πι	Pi	/p/	Circle constant π ≈ 3.14159, capital product operator ∏, prime-counting function π(x), osmotic pressure.
17	Ρ	ρ	Ρώ	Rho	/r/	Mass density (kg/m³), electrical resistivity (Ω·m), Pearson correlation coefficient in statistics.
18	Σ	σ, ς	Σίγμα	Sigma	/s/	Capital summation operator ∑, standard deviation (σ), mechanical stress, Stefan-Boltzmann constant.
19	Τ	τ	Ταυ	Tau	/t/	Mechanical torque (N·m), shear stress, RC circuit time constant, proper time, circle constant (τ = 2π).
20	Υ	υ	Ύψιλον	Upsilon	/juː/ or /i/	Kinematic frequency, Upsilon meson subatomic particle, celestial coordinates.
21	Φ	φ, ϕ	Φι	Phi	/f/ or /faɪ/	Golden ratio φ ≈ 1.6180339887, magnetic flux (Weber), electric potential, cumulative normal CDF Φ(x).
22	Χ	χ	Χι	Chi	/kaɪ/ or /x/	Chi-square distribution (χ² test), electronegativity (Pauling scale), Euler characteristic in topology.
23	Ψ	ψ	Ψι	Psi	/saɪ/ or /ps/	Quantum wave function Ψ(x,t) in Schrödinger equation, polygamma function, psychology emblem.
24	Ω	ω	Ωμέγα	Omega	/oʊˈmeɪɡə/	Electrical resistance unit (Ohm Ω), angular velocity (ω rad/s), sample space in probability, Big Omega Ω(n).

MATHEMATICAL & PHYSICAL CONSTANTS

Deep Dive: Essential Greek Symbols Across Physics, Math & Statistics

Greek letters serve specific canonical roles across scientific branches. Understanding their exact context avoids ambiguity in formula derivation:

π / Π

Pi (π) & Product (Π)

Geometry, Calculus & Series

Archimedes' Constant (π ≈ 3.14159) defines the ratio of any circle's circumference to its diameter ($C = 2pi r$).

Euler's Identity: $e^{ipi} + 1 = 0$, linking the five foundational mathematical constants ($e, i, pi, 1, 0$).
Capital Product (∏): $prod_{i=1}^{n} x_i = x_1 cdot x_2 cdot dots cdot x_n$ multiplies a series of terms.
Probability & Number Theory: Appears in the normal Gaussian distribution ($1/sqrt{2pisigma^2}$) and prime number theorem ($pi(x) sim x/ln x$).

θ / Θ

Theta (θ) & Angular Metrics

Trigonometry & Algorithms

The standard variable for unknown plane angles, angular coordinates, and algorithmic bounds.

Polar Coordinates: $(r, heta)$ where $x = rcos heta$ and $y = rsin heta$.
Big Theta ($Theta$): Tight asymptotic computational bound in computer science ($f(n) = Theta(g(n))$).
Thermodynamics: Potential temperature in meteorology and atmospheric physics.

σ / Σ

Sigma (σ) & Summation (Σ)

Statistics, Mechanics & Series

Foundational operator for mathematical accumulation and statistical dispersion.

Capital Summation ($sum$): $sum_{i=1}^{n} i = rac{n(n+1)}{2}$.
Standard Deviation ($sigma$): $sigma = sqrt{rac{1}{N}sum_{i=1}^{N}(x_i - mu)^2}$.
Solid Mechanics: Normal tensile/compressive stress ($sigma = F/A$) in Pascals (N/m²).

Δ / δ

Delta (Δ) & Differentials

Calculus, Physics & Functions

Universal symbol for finite difference, change, and generalized distribution functions.

Change Operator: $Delta v = v_f - v_i$ (rate of change $Delta y / Delta x$).
Dirac Delta ($delta$): $int_{-infty}^{infty} f(t)delta(t),dt = f(0)$.
Laplace Operator ($Delta$ or $ abla^2$): $Delta f = rac{partial^2 f}{partial x^2} + rac{partial^2 f}{partial y^2} + rac{partial^2 f}{partial z^2}$.

MASTER GREEK CODE MATRIX

Master Greek Symbols Reference & Alt Code Lookup Matrix

The following authoritative reference table provides a comprehensive lookup matrix for all 24 Greek letters in both uppercase and lowercase, plus mathematical variants, Windows Alt codes, Mac Option shortcuts, Unicode hexadecimal codepoints, HTML named entities, and LaTeX math commands:

Glyph	Greek Letter Name	Windows Alt Code	Mac Shortcut	Unicode Hex	HTML Entity	LaTeX Command
α	Alpha (Lowercase) (άλφα)	`Alt 224`	`Greek Layout: a`	`U+03B1`	`α`	`\alpha`
Α	Alpha (Uppercase) (Άλφα)	`Alt 913`	`Greek Layout: A`	`U+0391`	`Α`	`A`
β	Beta (Lowercase) (βήτα)	`Alt 225`	`Option + s (German ß) / Greek: b`	`U+03B2`	`β`	`\beta`
Β	Beta (Uppercase) (Βήτα)	`Alt 914`	`Greek Layout: B`	`U+0392`	`Β`	`B`
γ	Gamma (Lowercase) (γάμμα)	`Alt 947`	`Greek Layout: g`	`U+03B3`	`γ`	`\gamma`
Γ	Gamma (Uppercase) (Γάμμα)	`Alt 226`	`Greek Layout: G`	`U+0393`	`Γ`	`\Gamma`
δ	Delta (Lowercase) (δέλτα)	`Alt 235`	`Greek Layout: d`	`U+03B4`	`δ`	`\delta`
Δ	Delta (Uppercase) (Δέλτα)	`Alt 916`	`Option + j (Mac US) / Greek: D`	`U+0394`	`Δ`	`\Delta`
ε	Epsilon (Lowercase) (έψιλον)	`Alt 238`	`Greek Layout: e`	`U+03B5`	`ε`	`\varepsilon`
ϵ	Epsilon Lunate (Variant) (έψιλον)	`Alt 1013`	`Character Viewer`	`U+03F5`	`ϵ`	`\epsilon`
Ε	Epsilon (Uppercase) (Έψιλον)	`Alt 917`	`Greek Layout: E`	`U+0395`	`Ε`	`E`
ζ	Zeta (Lowercase) (ζήτα)	`Alt 950`	`Greek Layout: z`	`U+03B6`	`ζ`	`\zeta`
Ζ	Zeta (Uppercase) (Ζήτα)	`Alt 918`	`Greek Layout: Z`	`U+0396`	`Ζ`	`Z`
η	Eta (Lowercase) (ήτα)	`Alt 951`	`Greek Layout: h`	`U+03B7`	`η`	`\eta`
Η	Eta (Uppercase) (Ήτα)	`Alt 919`	`Greek Layout: H`	`U+0397`	`Η`	`H`
θ	Theta (Lowercase) (θήτα)	`Alt 233`	`Greek Layout: u`	`U+03B8`	`θ`	`\theta`
ϑ	Theta (Cursive Variant) (θήτα)	`Alt 977`	`Character Viewer`	`U+03D1`	`ϑ`	`\vartheta`
Θ	Theta (Uppercase) (Θήτα)	`Alt 920`	`Greek Layout: U`	`U+0398`	`Θ`	`\Theta`
ι	Iota (Lowercase) (ιώτα)	`Alt 953`	`Greek Layout: i`	`U+03B9`	`ι`	`\iota`
Ι	Iota (Uppercase) (Ιώτα)	`Alt 921`	`Greek Layout: I`	`U+0399`	`Ι`	`I`
κ	Kappa (Lowercase) (κάππα)	`Alt 954`	`Greek Layout: k`	`U+03BA`	`κ`	`\kappa`
ϰ	Kappa (Script Variant) (κάππα)	`Alt 1008`	`Character Viewer`	`U+03F0`	`ϰ`	`\varkappa`
Κ	Kappa (Uppercase) (Κάππα)	`Alt 922`	`Greek Layout: K`	`U+039A`	`Κ`	`K`
λ	Lambda (Lowercase) (λάμδα)	`Alt 955`	`Greek Layout: l`	`U+03BB`	`λ`	`\lambda`
Λ	Lambda (Uppercase) (Λάμδα)	`Alt 923`	`Greek Layout: L`	`U+039B`	`Λ`	`\Lambda`
μ	Mu (Lowercase) (μι)	`Alt 230`	`Option + m (Mac US) / Greek: m`	`U+03BC`	`μ`	`\mu`
Μ	Mu (Uppercase) (Μι)	`Alt 924`	`Greek Layout: M`	`U+039C`	`Μ`	`M`
ν	Nu (Lowercase) (νι)	`Alt 957`	`Greek Layout: n`	`U+03BD`	`ν`	`\nu`
Ν	Nu (Uppercase) (Νι)	`Alt 925`	`Greek Layout: N`	`U+039D`	`Ν`	`N`
ξ	Xi (Lowercase) (ξι)	`Alt 958`	`Greek Layout: x`	`U+03BE`	`ξ`	`\xi`
Ξ	Xi (Uppercase) (Ξι)	`Alt 926`	`Greek Layout: X`	`U+039E`	`Ξ`	`\Xi`
ο	Omicron (Lowercase) (όμικρον)	`Alt 959`	`Greek Layout: o`	`U+03BF`	`ο`	`o`
Ο	Omicron (Uppercase) (Όμικρον)	`Alt 927`	`Greek Layout: O`	`U+039F`	`Ο`	`O`
π	Pi (Lowercase) (πι)	`Alt 227`	`Option + p (Mac US) / Greek: p`	`U+03C0`	`π`	`\pi`
ϖ	Pi (Pomega Variant) (πι)	`Alt 982`	`Character Viewer`	`U+03D6`	`ϖ`	`\varpi`
Π	Pi (Uppercase / Product) (Πι)	`Alt 928`	`Option + Shift + P / Greek: P`	`U+03A0`	`Π`	`\Pi`
ρ	Rho (Lowercase) (ρώ)	`Alt 961`	`Greek Layout: r`	`U+03C1`	`ρ`	`\rho`
ϱ	Rho (Tail Variant) (ρώ)	`Alt 1009`	`Character Viewer`	`U+03F1`	`ϱ`	`\varrho`
Ρ	Rho (Uppercase) (Ρώ)	`Alt 929`	`Greek Layout: R`	`U+03A1`	`Ρ`	`P`
σ	Sigma (Lowercase) (σίγμα)	`Alt 229`	`Greek Layout: s`	`U+03C3`	`σ`	`\sigma`
ς	Sigma Final (Word-Ending) (τελικό σίγμα)	`Alt 962`	`Greek Layout: w`	`U+03C2`	`&sigmaf;`	`\varsigma`
Σ	Sigma (Uppercase / Summation) (Σίγμα)	`Alt 228`	`Option + w (Mac US) / Greek: S`	`U+03A3`	`Σ`	`\Sigma`
τ	Tau (Lowercase) (ταυ)	`Alt 231`	`Option + t (Greek: t)`	`U+03C4`	`τ`	`\tau`
Τ	Tau (Uppercase) (Ταυ)	`Alt 932`	`Greek Layout: T`	`U+03A4`	`Τ`	`T`
υ	Upsilon (Lowercase) (ύψιλον)	`Alt 965`	`Greek Layout: y`	`U+03C5`	`υ`	`\upsilon`
Υ	Upsilon (Uppercase) (Ύψιλον)	`Alt 933`	`Greek Layout: Y`	`U+03A5`	`Υ`	`\Upsilon`
φ	Phi (Lowercase Curly) (φι)	`Alt 237`	`Greek Layout: f`	`U+03C6`	`φ`	`\varphi`
ϕ	Phi (Straight Variant) (φι)	`Alt 981`	`Character Viewer`	`U+03D5`	`ϕ`	`\phi`
Φ	Phi (Uppercase) (Φι)	`Alt 232`	`Greek Layout: F`	`U+03A6`	`Φ`	`\Phi`
χ	Chi (Lowercase) (χι)	`Alt 967`	`Greek Layout: c`	`U+03C7`	`χ`	`\chi`
Χ	Chi (Uppercase) (Χι)	`Alt 935`	`Greek Layout: C`	`U+03A7`	`Χ`	`X`
ψ	Psi (Lowercase) (ψι)	`Alt 968`	`Greek Layout: y`	`U+03C8`	`ψ`	`\psi`
Ψ	Psi (Uppercase) (Ψι)	`Alt 936`	`Greek Layout: Y`	`U+03A8`	`Ψ`	`\Psi`
ω	Omega (Lowercase) (ωμέγα)	`Alt 969`	`Greek Layout: v`	`U+03C9`	`ω`	`\omega`
Ω	Omega (Uppercase / Ohm) (Ωμέγα)	`Alt 234`	`Option + z (Mac US) / Greek: V`	`U+03A9`	`Ω`	`\Omega`
∇	Nabla / Del Operator (ανάδελτα)	`Alt 8711`	`Character Viewer`	`U+2207`	`∇`	`\nabla`
Ϝ	Digamma (Wau) (δίγαμμα)	`Alt 988`	`Character Viewer`	`U+03DC`	`Ϝ`	`\digamma`
Ϙ	Koppa (κόππα)	`Alt 984`	`Character Viewer`	`U+03D8`	`Ϙ`	`\textkoppa`
Ϡ	Sampi (σαμπί)	`Alt 992`	`Character Viewer`	`U+03E0`	`Ϡ`	`\textsampi`

TYPING & KEYBOARD SHORTCUTS

How to Type Greek Symbols on Windows, Mac, Word, and LaTeX

Follow these verified step-by-step methods to type Greek letters across desktop operating systems, office applications, and math typesetting engines:

Windows 10 & 11 Keyboards

Numeric Keypad Alt Codes

Alpha (α): Hold Alt + type 224
Beta (β): Hold Alt + type 225
Gamma (Γ): Hold Alt + type 226
Pi (π): Hold Alt + type 227
Sigma (Σ): Hold Alt + type 228 | Lowercase (σ): Alt + 229
Mu (μ): Hold Alt + type 230 (or Alt + 0181)
Theta (θ): Hold Alt + type 233
Omega (Ω): Hold Alt + type 234
Phi (φ): Hold Alt + type 237 | Uppercase (Φ): Alt + 232
Symbol HUD: Press Win + . → click Symbols (Ω) → select Greek.

Apple macOS Keyboards

Option Keys & Greek Input

Pi (π): Press Option + p
Mu (μ): Press Option + m
Capital Sigma (Σ): Press Option + w
Capital Omega (Ω): Press Option + z
Capital Delta (Δ): Press Option + j
Integral / Beta (∫): Press Option + b
Greek Layout: Go to System Settings > Keyboard > Input Sources > Add Greek. Switch with Control + Space for direct 1-to-1 phonetic Greek typing (a → α, b → β, g → γ, d → δ).

Word & Google Docs

Equation Editor & Alt+X

Word Equation Mode: Press Alt + = to open Equation Editor, type \alpha, \beta, \theta, \lambda, \pi, \sigma, \omega, or \Omega and press Space.
Word Alt+X Toggles: Type 03B1 + Alt + X → α | 03C0 + Alt + X → π | 03A9 + Alt + X → Ω | 0394 + Alt + X → Δ
Symbol Font Trick: Type Latin letters (a, b, g, d, p, t) and change font family to Symbol.

LaTeX, Python & Web

MathJax, Unicode & HTML

LaTeX Math Mode: $\alpha, \beta, \gamma, \delta, \theta, \lambda, \pi, \sigma, \omega$
LaTeX Uppercase: $\Gamma, \Delta, \Theta, \Lambda, \Xi, \Pi, \Sigma, \Phi, \Psi, \Omega$
HTML Entities: α (α), β (β), π (π), θ (θ), Ω (Ω), Δ (Δ)
Python / Julia: import numpy as np; alpha = 0.05; pi = np.pi (Native UTF-8 support allows α = 0.05 in Julia & Python 3).

FREQUENTLY ASKED QUESTIONS

Frequently Asked Questions About Greek Symbols

The classic Windows Alt code for lowercase Pi (π) is Alt + 227 (or Alt + 960) on the physical numeric keypad. In Microsoft Word, you can also type 03C0 and press Alt + X. On a Mac, press Option + p.

The Windows numeric keypad Alt code for lowercase Theta (θ) is Alt + 233 (or Alt + 952). For uppercase Theta (Θ), use Alt + 920. In Microsoft Word, type 03B8 followed by Alt + X.

The 24 Greek letters in classical order are: 1. Alpha (Α, α), 2. Beta (Β, β), 3. Gamma (Γ, γ), 4. Delta (Δ, δ), 5. Epsilon (Ε, ε), 6. Zeta (Ζ, ζ), 7. Eta (Η, η), 8. Theta (Θ, θ), 9. Iota (Ι, ι), 10. Kappa (Κ, κ), 11. Lambda (Λ, λ), 12. Mu (Μ, μ), 13. Nu (Ν, ν), 14. Xi (Ξ, ξ), 15. Omicron (Ο, ο), 16. Pi (Π, π), 17. Rho (Ρ, ρ), 18. Sigma (Σ, σ, ς), 19. Tau (Τ, τ), 20. Upsilon (Υ, υ), 21. Phi (Φ, φ), 22. Chi (Χ, χ), 23. Psi (Ψ, ψ), and 24. Omega (Ω, ω).

On standard macOS US keyboards, several Greek letters have built-in Option shortcuts: Option + p produces π, Option + m produces μ, Option + w produces Σ, Option + z produces Ω, and Option + j produces Δ. To type all 24 Greek letters, press Control + Command + Space to open the Character Viewer, or add 'Greek' in System Settings > Keyboard > Text Input > Input Sources.

HTML named entities follow a simple standard: α (α), Α (Α), β (β), γ (γ), Γ (Γ), δ (δ), Δ (Δ), θ (θ), Θ (Θ), λ (λ), Λ (Λ), μ (μ), π (π), Π (Π), σ (σ), Σ (Σ), ω (ω), and Ω (Ω).

Uppercase Delta (Δ) universally denotes 'change' or difference in variable values (such as Δx = x₂ - x₁ or velocity change Δv), the discriminant in quadratic equations (Δ = b² - 4ac), and the Laplace operator (∇²) in multivariate differential equations. Lowercase delta (δ) represents the Dirac delta function, Kronecker delta, and infinitesimal differences in calculus limit proofs.

In the Greek language, lowercase sigma has two distinct orthographic forms: standard medial sigma (σ) is used at the beginning or in the middle of a word (e.g., σεισμός), while final sigma (ς, Alt 962, U+03C2) is used exclusively when the letter occurs at the very end of a word (e.g., λόγος, Ήλιος). In mathematics and statistics, medial sigma (σ) is universally used for standard deviation.

In LaTeX math mode, lowercase Greek letters are typed with a backslash followed by the lowercase name: \alpha, \beta, \gamma, \delta, \epsilon, \theta, \lambda, \mu, \pi, \sigma, \omega. For uppercase Greek letters, capitalize the first letter: \Gamma, \Delta, \Theta, \Lambda, \Xi, \Pi, \Sigma, \Phi, \Psi, \Omega.

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