Or maybe just include rad/sec as an example, and specify it as angular or normal frequency?  Like `normal frequency (for example, Hz)` vs `angular frequency (for example, radians per second)`?

Matlab freqs says "the angular frequencies in rad/sec specified in real vector w"

There are other places this would need to be changed, for instance my changes to butter() include `For analog filters, Wn is in radians / second`, same as Matlab's butter(): `analog Butterworth filter with angular cutoff frequency Wn rad/s`.

Signal.chirp says `In the following, ‘Hz’ should be interpreted as ‘cycles per time unit’; there is no assumption here that the time unit is one second. The important distinction is that the units of rotation are cycles, not radians.`