Definition of figure 8:
(N) :
the fifth studio album by American singer-songwriter Elliott Smith, and the final studio album released during his lifetime.
(N) :
"Figure 8" is a song by English singer and songwriter Ellie Goulding from her second studio album, Halcyon.
(N) :
The figure 8 belay device is a piece of metal (usually an aluminum alloy) in the shape of an 8 with one large end and one small end.