Signs of Coordinates of a Point in Various Octants

x-coordinate signs and octants

Note the sign '+' or '-'

Octant

OXYZ *** +
OX’YZ *** -
OXY’Z *** +
OX’Y’Z *** -
OXYZ’ *** +
OX’YZ’ *** -
OXY’Z’ *** +
OX’Y’Z’ *** -

y-coordinate signs and octants


Octant

OXYZ *** +
OX’YZ *** +
OXY’Z *** -
OX’Y’Z *** -
OXYZ’ *** +
OX’YZ’ *** +
OXY’Z’ *** -
OX’Y’Z’ *** -

z-coordinate signs and octants

Octant

OXYZ *** +
OX’YZ *** +
OXY’Z *** +
OX’Y’Z *** +
OXYZ’ *** -
OX’YZ’ *** -
OXY’Z’ *** -
OX’Y’Z’ *** -

Equation of xy plane is z = 0.
Equation of yz palne is x = 0.
Equation of xz plane is y = 0.