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Title Description
Oblique In one sense, at an angle or not perfectly horizontal or vertical.
An Oblique triangle is any triangle that is not a right triangle.
Obtuse In common language Obtuse means obscure and confusing, obfuscatory.
An Obtuse angle measures more than 90 degrees (and less than 180 degrees).
Octant As we have four quadrants in the rectangular plane, we have eight Octants in rectangular space.
In three dimensions the three axes divide space into eight sections, each termed an Octant.
Odd Function An Odd Function adheres to this property: f(-x) = -f(x).
The standard sine function is an odd function.
Omega The last, or 24th, letter of the Greek alphabet is Omega.
Upper-case Omega is used for ohms, a unit of electrical resistance.
Lower-case Omega is used for angular velocity, a speed of rotation.
Ordered Pair Two coordinates are required to label a point in a plane, typically (x, y).
Ordered Triple Three coordinates are required to label a point in space, typically (x, y, z).
Orthocenter The Orthocenter of a triangle is the point of concurrence of the altitudes of the triangle.
Orthogonal Most generally Orthogonal means perpendicular to a plane.

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