"BASE" is an acronym that stands for four categories of fixed objects from which one can jump: buildings, antennas, spans (bridges), and earth (cliffs).
"BASE" er et akronym som står for de fire kategorier af faste objekter, man kan hoppe fra: Building (bygning) Antenna (antenne) Span (spænd, f.eks. fra en bro) Earth (jord, bjergtoppe ol.)