@code{engineering}. This specifies the format in which the number will
be printed.@* @code{scientific} specifies that the number will be printed
using scientific notation: @code{@var{x}.@var{xxx}e@var{yyy}}. In other
-words, the number is printed as a mantissa between zero inclusive and
+words, the number is printed as a significand between zero inclusive and
ten exclusive, and an exponent. @code{engineering} is like
@code{scientific}, except that the exponent is always a power of three,
-and the mantissa is constrained to be between zero inclusive and 1000
+and the significand is constrained to be between zero inclusive and 1000
exclusive. If @code{normal} is specified, the number will be printed in
positional notation if it is ``small enough'', otherwise it is printed
in scientific notation. A number is ``small enough'' when the number of