The units for wave speed are the same as the units for any speed: distance per unit time.

Here are some common units for wave speed:

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

* Kilometers per hour (km/h): This is a common unit for everyday speeds.

* Miles per hour (mph): This is the standard unit in the United States.

* Feet per second (ft/s): This is another common unit in the United States.

The specific unit used will depend on the context and the desired level of precision.