AB

A popular baseball statistic that represents the number of times a player comes to home plate to bat; can also stand for "at bats" for a player who has multiple plate appearances; used to calculate the batting avg of a player by dividing the number of hits by at bats.

AB stands for "action by," which is often used in emails to communicate when you want something done by a certain time, aka a deadline.

It is typically used in work-related emails when a superior needs an employee to complete a task or project by a time of day or date. The acronym is especially helpful when a person is busy and doesn't have time to type everything out.

There are plenty of things that need to be completed -- both big and small. Examples include purchasing office supplies, putting together a real estate proposal, coordinating musicians for a charity performance, summarizing quarterly earnings, or launching a website.