Figure-four
The term figure-four may refer to:

Figure-four (climbing), a technique employed in technical climbing, particularly mixed and ice climbing
Figure-four (grappling hold), a type of grappling hold
A variation of the Jackknife hold
A descriptor of a professional wrestling hold; most notably the Figure four leglock
Figure Four, a Canadian metalcore band
Figure Four (Battle Angel Alita), a fictional character in the Battle Angel Alita manga series
Figure-four deadfall, a type of trap
Fig.4.0, an English hardcore punk band