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The symbol º, o, or o, is a masculine ordinal indicator used to denote ordinal numbers in Portuguese, Spanish and Italian. The indicator is a superscript lowercase o, which is the masculine ending for an adjective in the three languages, and may be underlined. It is often confused with the degree symbol (°), but the border of the circle in the degree symbol has a uniform width while in most typefaces the sides of the indicator have a thicker border than the top and bottom. For example, 1st (first) in English is written as 1º (primero).
The World Wide Web Consortium and the Unicode Consortium have deprecated the use of the character º whenever superscript markup is available.[1] (http://www.unicode.org/reports/tr20/) For example, in XHTML 12<sup>o</sup> should be used instead of 12º.
See also
- Feminine ordinal indicator (or ª, a superscript a)