but only in that context. Allographs and synoglyphs are also known informally as display variants.

0 and O; 1, l and I

Two common and important sets of homoglyphs in use today are the digit zero <0> and the capital letter ; and the digit one <1>, the lowercase letter L and the uppercase i . In the early days of mechanical typewriters it was common to omit keys for the digits <1> and <0>, and the keys for the letters and produced glyphs used for both characters. As typists who had used such typewriters transitioned in the 1970s and 1980s to being computer keyboard operators, their old keyboarding habits continued with them and were an occasional source of confusion.

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