Luckily, "xkcd" doesn't refer to anything else than the comic AFAIK, so we can easily search and find that 143 English Wikipedia articles reference the comic. [0] Glossing over the list, I'd count 4 of these are directly referencing a specific comic or a concept invented in one: Time, Ballmer Peak, and Geohashing.
There are more if you include special pages, like Citogenesis reported by sibling.
The other way around, folks at the Explain xkcd wiki have categorized the comics and 56 of them reference Wikipedia. [1]
There are more if you include special pages, like Citogenesis reported by sibling.
The other way around, folks at the Explain xkcd wiki have categorized the comics and 56 of them reference Wikipedia. [1]
[0] https://en.wikipedia.org/w/index.php?title=Special:Search&fu...
[1] https://www.explainxkcd.com/wiki/index.php/Category:Wikipedi...