Is "half-byte" ever actually used as a term?

Is "half-byte" ever actually used as a term?

Okay, so if a byte is 8-bits, then a half-byte would simply 4-bits. And
you could have a quarter-byte as 2-bits (though I guess, if anything, it'd
be reffered to as a double-bit).
While this is consistent, would anyone be confused (or surprised) if I
used the term? Obviously, it would be fairly easy for them to grasp what I
was referring to, but is it actually a commonly used term?