homoglyph
A character identical or nearly identical in appearance to another, but which differs in the meaning it represents; thus, in character encoding terms, a character with an identical or near-identical glyph, or the glyph itself.
The homoglyphs I (uppercase i) and l (lowercase L) confused many who typed in the URL.
Where it comes from
First attested in 1938; formed as homo- (“same”) + glyph after homograph.
Adapted from the Wiktionary entry homoglyph (CC BY-SA 4.0).