Octothorp

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