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.

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Greek Alphabet Reference

All 24 Greek letters with names, pronunciation and uses.

The Greek alphabet, with names and uses

All 24 Greek letters — uppercase and lowercase forms, names, pronunciation, the nearest Latin equivalent, and the common uses you will meet in maths, physics and engineering (π for the circle constant, λ for wavelength, Σ for summation, Ω for ohms, and so on).

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