ASP is short for Armament Systems & Procedures. It is a company that manufactures batons, among other weapons. ASP batons - also called telescopic batons - have three steel shafts that slide into each other. When the baton is collapsed, it takes up just a few inches of length. But when it is fully extended, it triples in size and can be used to hit an assailant. Brandishing ASP batons on another person can cause severe blunt-force injuries. Most people refer to any telescopic baton as an ASP baton even when ASP did not manufacture it.