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Point
A point 0-dimensional mathematical object, which can be specified in 
-dimensional space using 
coordinates. Although
the notion of a point is intuitively rather clear, the mathematical machinery used
to deal with points and point-like objects can be surprisingly slippery. This difficulty
was encountered by none other than Euclid himself who, in his Elements,
gave the vague definition of a point as "that which has no part."
The basic geometric structures of higher dimensional geometry--the line, plane, space, and hyperspace--are all built up of infinite numbers of points arranged in particular ways.
These facts lead to the mathematical pun, "without geometry, life is pointless."
The decimal point in a decimal expansion is voiced as "point" in the United States, e.g., 3.1415 is voiced "three point one four one five," whereas a comma is used for this purpose in continental Europe.
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prime number
