Octothorp vs. Octothorpe

Octothorpnoun

A typographic symbol having two vertical lines intersected by two horizontal lines. It is also called the crosshatch, hash, numeral sign and number sign; in the U. S. it is commonly called the pound sign, especially to designate the symbol as used on digital telephone dials, but this can be confusing to Europeans who think of the pound sign as the symbol for the British pound. It is commonly used as a symbol for the word number; as in #36 (meaning: number thirty-six).

Octothorpenoun

The hash or square symbol (#), used mainly in telephony and computing.

Octothorpenoun

on a push-button telephone. Rumor at the telephone company is that a man named Charles B. Octothorp, wanting to make his name famous...