| separatrix (|) |
| Definition:
The symbol |. It was once used to perform the function that is now performed by the decimal point (e.g., 2|3 = 2.3). Note: Though obsolete now, it was also another name for the forward slash. |
| Etymology: The word derives from the Late Latin separare, to separate. |
| Oxford English Dictionary: The word's first OED citation is from 1660: "But the best and most distinct way of distinguishing them [sc. Decimals] is by a rectangular line after the place of the unit, called Seperatrix. …. [Ibid. 13] Therefore in writing of decimal parts let the seperatrix be always used." (J. Moore Arith. 11) |