| big | small | name |
| Α | α | alpha |
| Β | β | beta |
| Γ | γ | gamma |
| Δ | δ | delta |
| Ε | ε | epsilon |
| Ζ | ζ | zeta |
| Η | η | eta |
| Θ | θ | theta |
| Ι | ι | iota |
| Κ | κ | kappa |
| Λ | λ | lambda |
| Μ | μ | mu |
| Ν | ν | nu |
| Ξ | ξ | xi |
| Ο | ο | omicron |
| Π | π | pi |
| Ρ | ρ | rho |
| Σ | σ/ς | sigma |
| Τ | τ | tau |
| Υ | υ | upsilon |
| Φ | φ | phi |
| Χ | χ | chi |
| Ψ | ψ | psi |
| Ω | ω | omega |
| π | pi | small | constant | 3.14 (roughly) ratio of diameter to circumference of a circle |
| Ω | ohm | big | unit of measure | electrical resistance |
| ε | epsilon | small | constant ? | physics, math ? |
| Δ | delta | big | means “change in” | math, calculus |
| θ | theta | small | angle | trigonometry, computer graphics |
college fraternaties and sororities use only big letters
| ΦΒΚ | Phi Beta Kappa, first american fraternity, 1776 |
| ΠΚΑ | Pi Kappa Alpha |
| ΑΦΑ | Alpha Phi Alpha |
| ΤΚΕ | Tau Kappa Epsilon |
| ΣΑΕ | Sigma Alpha Epsilon |
| ΣΦΕ | Sigma Phi Epsilon |
| ΚΑ | Kappa Alpha Society |
| ΣΧ | Sigma Chi |
| ΛΣΥ | Lambda Sigma Upsilon |
| ΚΔΡ | Kappa Delta Rho |
| ΣΝ | Sigma Nu |
| ΑΤΩ | Alpha Tau Omega |
| ΔΧ | Delta Chi |
| ΛΧΑ | Lambda Chi Alpha |
| ΒΘΦ | Beta Theta Phi |
| ΝΑΚ | Nu Alpha Kappa |
some big letters are same as latin
| Α | alpha |
| Β | beta |
| Ε | epsilon |
| Ζ | zeta |
| Η | eta |
| Ι | iota |
| Κ | kappa |
| Μ | mu |
| Ν | nu |
| Ο | omicron |
| Ρ | rho |
| Τ | tau |
| Υ | upsilon |
| Χ | chi |