One variation used a short vertical bar instead of the dot. Its appearance has continued with Taligent's command line typeface Andalé Mono. The digit 0 with a dot in the centre seems to have originated as an option on IBM 3270 displays. The distinction came into prominence on modern character displays. Typewriters originally made no distinction in shape between O and 0 some models did not even have a separate key for the digit 0. Traditionally, many print typefaces made the capital letter O more rounded than the narrower, elliptical digit 0.
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