The US EMALS means Electromagnetic
Aircraft Launch System literally.
I think EMALS could also be abbreviation of Electro-Magnetic
Assisted Launch System. In this case, EMALS can be treated a concept or general name for all EM aircraft launch systems just like LASER or SONAR, but not the name of a production of some company.
It's unlike the abbreviation AAG. We cannot call an electric-magnetic arresting systems AAG, because AAG(Advanced Arresting Gear) is something like a trademark of General Atomics and does not correctly describe the mechanism of the arresting system. I would prefer to call it EMERAS(Electro-Magnetic Energy Recovery and Arresting System) for the one on CV-18 and other future alike systems.
EMALS and EMERAS, or link them together, EMALERAS.