also nonstandard, "not average or usual," 1926, from non- + standard. A linguist's value-neutral term for language that is not of the form that is accepted as standard, which was formerly stigmatized as bad or vulgar.
a prefix used freely in English and meaning "not, lack of," or "sham," giving a negative sense to any word, 14c., from Anglo-French noun-, from Old French non-, from Latin non "not, by no means, not at all, not a," from Old Latin noenum "not one" (*ne oinom, from PIE root *ne- "not" + PIE root *oi-no- "one, unique"). In some cases perhaps from Middle English non "not" (adj.), from Old English nan (see not). "It differs from un- in that it denotes mere negation or absence of the thing or quality, while un- often denotes the opposite of the thing or quality" [Century Dictionary].
mid-12c., "flag or other conspicuous object to serve as a rallying point for a military force," from shortened form of Old French estandart "military standard, banner." According to Barnhart, Watkins and others, this is probably from Frankish *standhard, literally "stand fast or firm," a compound of unrecorded Frankish words cognate stand (v.) and hard (adj.). So called because the flag was fixed to a pole or spear and stuck in the ground to stand upright. The other theory [OED, etc.] calls this folk-etymology and connects the Old French word to estendre "to stretch out," from Latin extendere (see extend). Some senses (such as "upright pole," mid-15c.) seem to be influenced by if not from stand (v.). Standard-bearer in the figurative sense is from 1560s.
<a href="https://www.etymonline.com/word/non-standard">Etymology of non-standard by etymonline</a>
Harper, D. (n.d.). Etymology of non-standard. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/non-standard