ΔT

The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts.

Time

* 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#Average_velocity, velocity
* The increment between Neural coding#Time-dependent firing rate, successive nerve impulses

Temperature

* to mean a difference in temperature including thermodynamic temperature, may occur in
** Discussions of Climate sensitivity, climate change
** Discussions of Heat transfer coefficient, heat transfer
** Discussions of the effects of Microscale thermophoresis#Technology, thermal gradients

See also

* Delta time (disambiguation)
* Finite difference for the mathematics of the ''Δ'' operator
* Δ for the Greek letter Delta
* ∂ for the mathematical symbol used in the notation "∂T"

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