What's the noun for abbreviature? Here's the word you're looking for.
abbreviation
The result of shortening or reducing; abridgment. [First attested around 1350 to 1470.]
(linguistics) A shortened or contracted form of a word or phrase, used to represent the whole, utilizing omission of letters, and sometimes substitution of letters, or duplication of initial letters to signify plurality, including signs such as +, =, @. [Late 16th century.]
The process of abbreviating. [Mid 16th century.]
(music) A notation used in music score to denote a direction, as pp or mf.
(historical, Roman Catholicism) One of a college of seventy-two officers of the papal court whose duty is to make a short minute of a decision on a petition, or reply of the pope to a letter, and afterwardsexpand the minute into official form. [Mid 16th century.]