The Milwaukee brand of reciprocating saw (where the blade moves back and forth, or "reciprocates"), that is now so ubiquitous that the name is applied to other similar products (Tiger saw, etc.) Designed for quick, if not delicate, cuts, it's commonly used in demolition or for cutting large pieces of lumber in awkward locations. Also cuts metal with the appropriate blade. Like Leko, Sawzall is often used mistakenly to refer to other brands of reciprocating saws.
Picture from www.rentaltoolsandequipment.com
Picture from www.rentaltoolsandequipment.com
