Hyper is the name of a modifier bit which a keyboard input character may have To make a character Hyper, type it while holding down the HYPER key Such characters are given names that start with Hyper- (usually written H- for short) See section Keyboard Input
If someone is hyper, they are very excited and energetic. I was incredibly hyper. I couldn't sleep. = hyperactive. extremely excited or nervous about something (hyperactive)