Speed is typically measured in units of distance per unit time. Here are some common units:

* Meters per second (m/s): The standard unit in the International System of Units (SI).

* Kilometers per hour (km/h): Commonly used for road travel.

* Miles per hour (mph): Used in the United States and some other countries.

* Feet per second (ft/s): Used in some engineering applications.

* Knots (kn): Used for nautical speed (1 knot = 1 nautical mile per hour).

The specific unit used depends on the context and the scale of the speed being measured.