Google SW and you get southwest. Another example: PI (private investigator, not power inserter.) I HATE it when people speak Millennial and jargon/code and then bash you for asking what it means because Googling it will get you many results with all the stupid #Icy Michigan garbage. BTW (common enough to use), I finally learned why people were writing Icy Michigan after things. "In Case You Missed It." But that still doesn't make sense when it's hashtagged at the end of something. XD #tbt #hashtagsarestupid. (insert 12 emojis from an i-phone and most people see boxes an hearts.)
That being said, I do realize that I have used abbreviations many times on here, but usually only with users on threads with users I recognize or clearly know the lingo.
Get off my lawn! And I am not old (mid 30s) but I ignore half the posts on this and the other site because they are filled with things that people can't spell out at least once so everyone can try to follow.