A point.
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Location.
They are identifiers of position or location.
A point in math has no linear dimension (hence size).
The specific location of something or in which something is occurring or has happened, or the measurement of something that happened or is happening is a point in geometry.
Dimension is either the length, width, or height of a shape. In a 2-D or flat object there are 2 dimensions (length and width). In a 3-D shape there are 3 dimensions (length,width, and height)