Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numeral ٠(0) (compare Devanāgarī script ०), adopted for use with the Latin script in Europe. See 0 § History for more.
(phonetics, often superscript) the pitch of a tone that is more extreme than 1 (higher or lower, depending on local convention; e.g. 0 is the highest tone in Chatino)
(phonetics, Sinosphere, often superscript) lack of an inherent tone; the pitch depends on the tones of the surrounding syllables.
The pronunciation as a digit is very often shortened to that of the letter O to save time or keep rhythm. This change is required for the tens place of minutes following the hour and in shortened pronunciation of numbers between 10 and 19 hundred, including years, as well as their truncated two-digit forms, where the zero is a leading digit. It is also very common when saying telephone numbers, decimals after the decimal point, the leading zero in decimal fractions less than one, or many other words such as 007double o seven.
2024, 陳詠儀 [Wing Yee Chan], 唐翊竣 [Yik Chun Tong], 謝家朗 [Ka Long Tse], “香港粵語否定詞“0”的語法特徵 [Grammatical Features of the Negative Word "0" in Hong Kong Cantonese]”, in 《中國語文通訊》, volume 103, number 1, →DOI, pages 43-65:
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A vintage clock with numbers 0–11.
The digit ‘0’ in a digital seven segment display.
