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What does double mean?
Double means a pair, a pair; In a double way; A portrait of a person; Fold in half; Double; Double it.

Double can be used as adjectives, adverbs and verbs.

Double (double-precision floating-point type) is a data type used by computers.

Compared with single-precision floating point number (float), double (double-precision floating point number) uses 64 bits (8 bytes) to store a floating point number. It can represent 15 or 16 significant digits in decimal system, with negative values ranging from-1.7976E+308 to -4.246544 e-324 and positive values ranging from 4.4. 46664866