Yes! So I googled a bit too and found this from a random internet source (January 2014)
"I just did a crossword puzzle and the answer to the clue "many a pizza slice" was "octant".
I find this definition via google:
an arc of a circle equal to one eighth of its circumference, or the area enclosed by such an arc with two radii of the circle. [Note: this justifies the pizza slice answer.]
each of eight parts into which a space or solid body is divided by three planes that intersect (especially at right angles) at a single point."
Researching further now... Nevermind giving up on this mathematical rabbit hole, it is far too late for this with work in the morning.