Abcoulomb is a unit of electric charge, representing the amount of charge transported by one ampere in one second. Some synonyms for the word include electromagnetic unit (emu), e.s.u. (electrostatic unit), and statcoulomb. These terms represent different units of charge that were used historically before the standardization of the International System of Units (SI). Other units of charge include the coulomb, faraday, and franklin. It is important to understand the different units of charge and their equivalences as they are commonly used in electrical engineering, physics, and other related fields.