A numeronym is a number-based word. Most commonly, a numeronym is a word where a number is used to form an abbreviation. Pronouncing the letters and numbers may sound similar to the full word: "K9" for "canine". Alternatively, the letters between the first and last are replaced with a number representing the number of letters omitted, such as "i18n" for "internationalization". Sometimes the last letter is also counted and omitted. These word shortenings are sometimes called alphanumeric acronyms, alphanumeric abbreviations, or numerical contractions.
According to Tex Texin, the first numeronym of this kind was "S12n", the electronic mail account name given to Digital Equipment Corporation employee Jan Scherpenhuizen by a system administrator because his surname was too long to be an account name. By 1985, colleagues who found Jan's name unpronounceable often referred to him verbally as "S12n". The use of such numeronyms became part of DEC corporate culture.
A number may also denote how many times the character before or after it is repeated. This is typically used to represent a name or phrase in which several consecutive words start with the same letter, as in W3 or W3C.