A homoglyph is a text characters with shapes that identical or similar to each other.
Common examples are zero/O and one/l .
More complex Homoglyphs are derived from characters used in other languages that are a part of Unicode. In the following, this website converts english text “EtherealMind” into characters that looks similar but use completely different HTML characters.
Homoglyphs are often used in spam to bypass language recognition and pattern matching systems.