"Plexiglass" is derived from the trade name "Oroglas" (a type of PMMA board), and is taken from "Organic Glass" (ie, plexiglass). But in recent years, all transparent plastics such as PS and PC are collectively referred to as plexiglass sheet. In fact, this is wrong. Acrylic refers specifically to pure polymethyl methacrylate (PMMA) material, and PMMA sheet is called acrylic sheet.
