graphic-char-p standard-char-p

(graphic-char-p character) -- (standard-char-p character)

Character predicates. graphic-char-p is true for a printing character -- code points 32 to 126 and everything from 160 up -- so #\Space counts and #\Newline does not. standard-char-p is true for the 96 standard characters: the printing ASCII range plus #\Newline, which is the one character the two predicates disagree on.