1) Jumping sport 
BASE jumping, also sometimes written as B.A.S.E. jumping, is an activity where participants jump from fixed objects and use a parachute to break their fall. `BASE` is an acronym that stands for four categories of fixed objects from which one can jump: building, antenna, span, and Earth (cliff). In the USA, BASE jumping is currently regarded by m.....
Using a packed parachute to jump from fi xed objects, often illegally. The acronym stands for the four categories of objects from which one can jump: buildings, antennae, spans and earth.