What is that tape that I see people use on audio gear to label things (knobs, sliders, jacks and such)? Generally they use a permanent marker on the tape itself, but not the gear. Presumably the tape can be removed without too much trouble when the label needs to change. It seems to be semi-permanent, but not permanent.
An example of its use would be labeling the channels on a hardware mixer to indicate what the channel's source is.
Is this some special kind of tape used for equipment? If so, what makes it special?