Suppose that we want to negate a generic compound adjective adjective1 adjective2 There's some uncertainty about whether. Except non is not an english word, it is a prefix of latin origin
Which is why american style manuals will always ask you to merge it with the subsequent word, without a hyphen A more faithful latin rendering of the phrase might be In expressions in which figures and abbreviations (or symbols.
I might be tempted to create an open compound, but non doesn’t stand alone. Usage definitely favors the latter. It's an english adaptation of a latin saying De gustibus non est disputandum
Meaning literally regarding taste, there is no dispute The phrase seems to be of medieval origin The origin is accepted as scholastic writings because of the grammar, which is atypical