Visual Spoofing
The Greek lunate Sigma ϲ (U+03f2) is quite similar to Latin small letter c (U+0063).
The halfwidth Katakana letter NO ﾉ (U+FF89) is similar to slash / (U+002f).
The Greek small letter Omicron ο (U+03BF) is quite similar to the Latin small letter o (U+006F).
The Cyrillic small letter е (U+0435) is quite similar to the Latin small letter e (U+0065).
The "I" with acute í (U+00ED) is quite similar to the Latin small letter i (U+0069).
The Latin small letter script ɡ (U+0261) is quite similar to the Latin small letter g (U+0067).
Example:
echo -e '\u0261'