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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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SIGN(number)
SIGN function returns 1 if the @number is positive, zero if the @number is 0, and -1 if the @number is negative.
This function is Excel compatible.
SIGN(3) equals 1.
SIGN(-3) equals -1.
SIGN(0) equals 0.
