Use visually distinct identifiers to eliminate errors resulting from misrecognizing the spelling of an identifier during the develoment and review of code. Depending on the fonts used, certain characters such asare visually similar or even identical:
- '1' (one) and 'l' (lower case L)
- '0' (zero) and 'O' (capital o)
are visually similar or even identical.
Do not define multiple identifiers which only vary with respect to one or more visually similar characters.
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