From Old Norse ír, variant of ér, from Proto-Germanic *jūz, from Proto-Indo-European *yū́.
(vulgar, slang) my ass, m'ass yours truly
I (uncountable) (metaphysics) The ego.
I (US, roadway) interstate (computing, programming) interface (as a prefix on the name of an entity) IEnumerable (grammar) Abbreviation of instrumental case.
I (chemistry) Symbol for iodine. (physics) Isotopic spin. (license plate codes) Italy (physics, electronics) Electrical current. (biochemistry) IUPAC 1-letter abbreviation for isoleucine (mathematics, linear algebra) identity matrix (analysis, topology) unit interval
I upper case (lower case i) The ninth letter of the basic modern Latin alphabet. I upper case (lower case ı) The letter i without a dot above, in both the upper case and the lower case versions.
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