Homoglyph[0] attack / IDN homograph attack[1] mitigation in the browser
[0] https://en.wikipedia.org/wiki/Homoglyph
[1] https://en.wikipedia.org/wiki/IDN_homograph_attack
It's silently converted to just "x.com", though I'm not sure what standard that's based on. It's not an IDN as the other comment suggests, as that character is disallowed under IDNA2008.
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Homoglyph[0] attack / IDN homograph attack[1] mitigation in the browser
[0] https://en.wikipedia.org/wiki/Homoglyph
[1] https://en.wikipedia.org/wiki/IDN_homograph_attack