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 for floating-point
From The Free On-line Dictionary of Computing (30 December 2018) :

      A number representation consisting
     of a mantissa, M, an exponent, E, and a radix (or
     "base").  The number represented is M*R^E where R is the
     In science and engineering, exponential notation or
     scientific notation uses a radix of ten so, for example, the
     number 93,000,000 might be written 9.3 x 10^7 (where ^7 is
     superscript 7).
     In computer hardware, floating point numbers are usually
     represented with a radix of two since the mantissa and
     exponent are stored in binary, though many different
     representations could be used.  The IEEE specify a
     standard representation which is used by many hardware
     floating-point systems.  Non-zero numbers are normalised so
     that the binary point is immediately before the most
     significant bit of the mantissa.  Since the number is
     non-zero, this bit must be a one so it need not be stored.  A
     fixed "bias" is added to the exponent so that positive and
     negative exponents can be represented without a sign bit.
     Finally, extreme values of exponent (all zeros and all ones)
     are used to represent special numbers like zero and positive
     and negative infinity.
     In programming languages with explicit typing,
     floating-point types are introduced with the keyword "float"
     or sometimes "double" for a higher precision type.
     See also floating-point accelerator, floating-point unit.
     Opposite: fixed-point.

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