predictive text engine where you put in terms like "i18n" and it works out what you must have meant and expands them. any number found in a word acts as a "there's some number of letters here", even if you provide additional letters in the middle of the word. "i10alization" works. "i4n4n8n" works. "authoritarianism" can be "a14m", but if you find that's coming up with another word, you can put "tar" in the middle to hint at it: a6tar5m