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Re:The closest I've ever come to falling for a Gmail phishin... by seanp2k2 on Wednesday January 11, 2017 @04:26PM (#13377622)
https://en.m.wikipedia.org/wiki/IDN_homograph_attack is what you're referencing, I believe :)
Re:The closest I've ever come to falling for a Gmail phishin... by Magicstatic on Wednesday January 11, 2017 @04:55PM (#13377842)
Interesting enough, HN itself was actually susceptible to this and it was reported by a security researcher:

https://news.ycombinator.com/security.html