The acronym stands for the categories of fixed objects aficionados can jump from: buildings, antennas, spans (bridges) and earth (cliffs, mountains).

BBC: Profile: Skydiver Felix Baumgartner

It takes its name from the four fixed objects - buildings, antennae, spans and earth - which divers use to take off.

BBC: Mother's grief at base jump death of Gary Harbird

In the 1990s, he moved from traditional skydiving to Base jumping, leaping off fixed objects and using a parachute to break the fall.

BBC: Profile: Skydiver Felix Baumgartner

Mobile and wireless are inextricably linked, with wireless being the enabler for mobile, and mobile having its own unique characteristics versus fixed wireless users or objects.

FORBES: The Crucial Difference Between Wireless And Mobile

Although robots are getting better at adapting to the real world, they still tend to tackle challenges with a fixed set of alternatives that can quickly become impractical as objects (and more advanced robots) complicate the situation.

ENGADGET: MIT algorithms teach robot arms to think outside of the box (video)