One of the eight regions of space defined by the eight possible combinations of signs 
for 
, 
,
and 
.
Octant
See also
Hyperoctant, QuadrantExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Octant." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Octant.html