natural logarithm: the logarithm with the base of e. Written: ln x.
natural numbers: the counting numbers.
negative number: a real number less than zero.
null set: same as empty set. A set with no elements.
number line: a line on which every point represents a real number.
numeral: a symbol that stands for a number.
numerator: the top of a fraction.
obtuse angle: an angle whose measure is greater than 90 degrees.
obtuse triangle: a triangle with an obtuse angle.
octagon: a polygon with 8 sides.
octahedron: a polyhedron with 8 faces.
octal number: a number in base 8.
odd function: a function that satisfies the property that f(-x) = -f(x).
odd number: a whole number that is not divisible by 2.
open interval: an interval that does not contain both its endpoints.
ordered pair: a set of two numbers in which
the order has an agreed upon meaning.
Such as the cartesian coordinates (x, y), where it is agreed that the first
coordinate represents the horizontal position, and the second coordinate
represents the vertical position.
ordinate: the second coordinate of a cartesian ordered pair.
origin: the point (0, 0) on a Cartesian Coordinate System.
orthocenter: the point in a triangle where the three altitudes intersect.
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