How many letters are in the Greek alphabet?

There are 24 letters, from alpha (Α α) to omega (Ω ω). This table lists every one with its uppercase and lowercase forms.

What is the difference between Σ and σ?

Uppercase Σ (Sigma) usually denotes a summation, while lowercase σ commonly denotes standard deviation or, in physics, stress and conductivity.

What are the first letters alpha, beta, gamma, delta used for?

Alpha (α) often marks an angle or significance level, beta (β) a coefficient or angle, gamma (γ) the Lorentz factor or a ratio, and delta (Δ, δ) a change or small difference.

Which Greek letter is pi, and what is it for?

Pi (π) is the 16th letter and denotes the circle constant ≈ 3.14159 — the ratio of a circle's circumference to its diameter.

How do I type Greek letters?

You can copy the glyph from the reference table, or on most systems insert it via a symbol picker. In LaTeX, \\alpha, \\beta, \\pi and so on produce the letters directly.

What is the last letter of the Greek alphabet?

Omega (Ω, ω) is the 24th and final letter. Uppercase Ω is the ohm in electrical resistance; lowercase ω often denotes angular frequency.

Is anything uploaded?

No — this is a static reference table that runs entirely in your browser.

Greek Alphabet Reference

This is a complete reference to the Greek alphabet — all 24 letters with uppercase and lowercase forms, names, pronunciation, the nearest Latin equivalent, and the common uses you meet in maths, physics and engineering. It’s handy for reading formulas, learning the alphabet, or finding which letter a symbol like λ or Ω is.

How it works

The page lists every letter from alpha (Α α) to omega (Ω ω) in order. Each row shows the uppercase glyph, the lowercase glyph, the letter’s name, how it is pronounced, the closest Latin letter, and where it typically appears in technical notation. The search box filters the table live — type a letter, a name, or a use such as “wavelength” or “summation” — so you can jump straight to what you need. It’s a static reference with no calculation.

Example

Looking up the symbols in a circle formula:

Letter	Lower	Name	Common use
Π	π	Pi	Circle constant ≈ 3.14159
Σ	σ	Sigma	Σ summation; σ standard deviation
Λ	λ	Lambda	Wavelength
Ω	ω	Omega	Ω ohms; ω angular frequency
Δ	δ	Delta	Change or small difference

Search “ohm” and the table jumps to omega (Ω). Everything runs in your browser — nothing is uploaded.