General Definition: 1. In context, this sign is used to refer to any thing or any action named by an English word beginning with the letter 'K', particularly if that word has already been fully fingerspelt in the conversation. Used especially for kilogram and kilometre. As a Noun: 1. A metric unit of weight that is a thousand grams. English = kilogram, kilo. 2. A metric unit of distance that is a thousand metres. English = kilometre, kilometer (US).