Many chemicals are often abbreviated as to make typing easier. Some are correct (Potassium Nitrate/KNO3) and others are short hand (Black Powder /BP where a more correct way would be KNO3/S/Charcoal)
Fe2O3=Ferric Oxide, Iron Oxide, Rust (red)
VOD=Velocity of Detonation
ACB=Anarchist Cook Book
Kewl= Lacking real knowledge and saying they did things that they didn’t. Following crappy text files and often using “Bombz” to destroy letterboxes. There English is often poor and they may write in all capital letters. Kewls are more likely to be harmed with explosives then anyone else.
Mesh=How fine a powder is. The higher the number the finer. The higher mesh size the smaller the particle.
Salute=Explodeing firecracker designed to make noise.
Crapbook/textfile= A document