With so many languages out there Just saying it's 3 letters is not enough to even say it's worth reg Fee You'd need to think about 1. What language is it? 2. What's the meaning? 3. Is it a commercial term? Just by saying 3 characters it could be 3 Japanese Characters 3 Symbols 3 French letters (word or not a real word) It could also be just a phishing domain. One that just looks like English Latin characters but is really not. These will never be typed in.
It seems you have expeirence with non english domains I dont think main value of 3 letters domains is in type in, but more in brandable name and easy rememberable one. ( uh, is there "rememberable" word in english at all ? ) I think IDN is more than great domain, I am not good in domain values,but I am sure I would like to have this one.
I do have bit of experience with IDNs & with IDNs which language really matters. Is it 3 Russian Letters Is it 3 Arabic Letters Is it 2 Russian Letters & 1 Latin letter. Is is something that a native in that language would actually type in? Is it 3 cyrillic letters That just Looks like English letters? If it's 3 cyrillic letters it could look like ABC RRD NBC The poster needs to post which language the characters are to get even close to a good response.