What's the multiplier value inside a trig function called?

Question

I'm trying to figure out what the b-value is called? y=sin(bx)

I've heard some say that it's the frequency or angular frequency, but if my x-values are radian values and not time then what would "b" be called?

Angular frequency seems more accurate than frequency. In my understanding, angular frequency, or angular speed, is the number of radians per second. And frequency is the number of cycles per second. But those are both per a time unit which means that "b" must be a unit of time. But my x value is the number of radians.

Answer 1

It's still frequency. The concept is the same, regardless of whether $x$ is a dimensionless quantity or not.