APU

The APU is a system om many airliners of today. It's like a really small jet/turbine engine in the very back of the plane. APU stands for Auxiliary Power Unit. It can be used for giving the plane own ectrical power(without engines running), and to start them. Some airlines include the APU in emergency procedures.

There's not really a sentence-based explanation of APU.

-Ish

Something that resembles something else but not quite sure to 100% what it is.

That plane looks like something 737-ish but could be an Airbus A319 too

Memable

An image or movie or section of a movie that can be made into a Meme

That scene in Monsters Inc. is so memable!