Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numerals (compare Devanagari script१(1,“éka”)), possibly influenced by Roman numeralⅠ, both ultimately from using a single stroke to represent the number one. See1 § As a digit on WikipediaWikipedia for more.
(phonetics, often superscript) thepitch of atone, either high or low depending on local convention; '1' is most commonly the highest or lowest pitch (but see0)
(phonetics, Sinosphere, often superscript) tone number 1, typically identified with dark levelyinping (陰平). May simply be levelping tone (平) if theyin–yang distinction is not made.
(Should wedelete(+) this sense?)(Internetslang,leetspeak,sarcastic)Deliberate misspelling of!, imitating someone who is too excited to consistently press theshift key while typing exclamation marks.