— Delta
Uppercase delta (Δ) means 'change in' — Δv is the change in velocity, Δt the change in time. It signals a difference between final and initial values, and sits at the heart of rates like acceleration a = Δv/Δt.
SI unit: Depends on the quantity
Used in
- Change in velocity Δv
- Change in time Δt
- Finite differences in calculus-based physics