A plaster saw, also called a cast saw, is a powered medical tool designed to remove orthopaedic casts without cutting skin, because its blade oscillates in a tiny arc instead of rotating. That safety design gives it its recognisable buzzing sound, different from a normal workshop saw. Recordings of it circulate online for sound design, training videos and edits that need a convincing hospital or workshop moment without filming a real procedure. Its steady, abrasive whine has become shorthand for cast removal in short clips and recreations.