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Binary number: In mathematics and digital electronics, a binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols: typically "0" and "1" (one). The base-2 numeral system is a positional notation with a radix of 2.
Binary relation: In mathematics, a binary relation between sets X and Y is a subset of the Cartesian product X × Y; that is, it is a set of ordered pairs consisting of elements x in X and y in Y. It encodes the information of relation: an element x is related to an element y, if and only if the pair (x, y) belongs to the set. A binary relation is the most studied special case n = 2 of an n-ary relation over sets X1, …, Xn, which is a subset of the Cartesian product X1 × … × Xn.An example of a binary relation is the "divides" relation over the set of prime numbers P and the set of integers Z, in which each prime p is related to each integer z that is a multiple of p, but not to an integer that is not a multiple of p.
Binary prefix: A binary prefix is a unit prefix for multiples of units in data processing, data transmission, and digital information, notably the bit and the byte, to indicate multiplication by a power of 2. The computer industry has historically used the units kilobyte, megabyte, and gigabyte, and the corresponding symbols KB, MB, and GB, in at least two slightly different measurement systems.