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xkcd #2841: Sign Combo
(imgs.xkcd.com)
A community for a webcomic of romance, sarcasm, math, and language.
Alt text on XKCD posts is the label that displays when you hover over the post on their website, it's not something that the user has added.
oh dang my bad didn't realize it had an xkcd specific meaning, thx for correcting me!