Periodic wave that oscillates between two discrete values

Question

I feel like I have seen one before, maybe in a simulation in Desmos, but is there a wave that looks like the following picture that changes between two values. And if so, what is it called?

Picutre of graph

Answer 1

It is called square wave. If $w(t)$ is the square wave $$ w(t) = \mathrm{sign}\left(\sin\left(\frac tT\right)\right) $$ and you want a wave that oscillates between values $a$ and $b$, then you can consider $$ \frac{a+b}2 + \frac{b-a}2 w(t) . $$

Of course to change the period you change $T$ and to shift in time you use $w(t-t_0)$.