Greek letters fill in where Roman letters run out — common in maths, physics and statistics.
Most-used
- α, β, γ — angles, parameters
- θ, φ — angles in trig
- π — 3.14159…
- Σ — sum
- Δ, δ — change, small change
- ∞ (infinity), ∇ (nabla, vector calc)
Greek letters fill in where Roman letters run out — common in maths, physics and statistics.