There are a number of security issues, mostly around using "look alike" Unicode characters in phishing/impersonation attacks. See, for example: http://unicode

There are a number of security issues, mostly around using "look alike" Unicode characters in phishing/impersonation attacks. See, for example: http://unicode.org/reports/tr36/ http://unicode.org/reports/tr36/ http://unicode.org/faq/security.html http://unicode.org/faq/security.html https://www.blackhat.com/presentations/bh-usa-09/WEBER/BHUSA09-Weber-UnicodeSecurityPreview-PAPER.pdf https://www.blackhat.com/presentations/bh-usa-09/WEBER/BHUSA...