The trouble – which was first noted way back in 2001 – is that some letters in other languages like Cyrillic are different but look almost identical. You can get identical-looking versions of "a", "B", "c", "i", "l", "O" and "p," among others.
So by combining the codes for these other letters with non-coded letters you can appear to spell out a word like "apple," therefore tricking people into visiting a different website from the one they think they are visiting.
Needless to say, the organization in charge of overseeing the domain name system, US-based ICANN, took this seriously and put out a warning back in 2005 on what it termed "homograph attacks."
And so it turned to its community of internet engineers and policy makers and opened a formal comment forum to come up with "countermeasures" and "improve public protection from abusive use of domain names."
That was 12 years ago. What's happened since?
Not much, it seems.