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The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts.
- ΔT (timekeeping) the difference between two time scales, Universal Time and Terrestrial Time, which results from a drift in the length of a day
- The interval of time used in determining velocity
- The increment between successive nerve impulses
- to mean a difference in temperature including thermodynamic temperature, may occur in