Completely made up and not related to anything else.
Except that it is a word, and does have a meaning.
So does 'halcyon days.'
TerraHertz is meant to be simultaneously a combined dual-meaning pun, and political statement.
Terra is the Latin name for Earth.
Also similar to Tera, for 10^12. The unit prefix in SI for 10^12 Symbol T.
Tera is derived from Greek word τέρας teras, meaning "monster".
Hertz as in Heinrich Hertz, cycles per sec, Hz.
Energy in the THz range lies in between visible light and microwaves. It acts like light, but penetrates more materials. We just can't see it. The world would look pretty weird if we could. We could see right through a lot of shit. We could see the monsters behind the facade.
So one meaning - penetrating Earth light.
Another, by the sound: terror hurts. Which has both a personal meaning for me, as well as the obvious one.
I use other nics in other contexts, but the whole point of that is to keep things separate and unconnected. So not going to list them. One is electronics-related and simple, so you'd think I'd use it here. But unfortunately, that would not be good.
Used in the past: BinaryTears, CylentRage