J 1
(also j )
■ noun ( plural Js or J's )
1》 the tenth letter of the alphabet.
2》 denoting the next after I in a set of items, categories, etc.
3》 archaic (as a Roman numeral) used instead of an I when in a final position.
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J 2
■ abbreviation
1》 jack.
2》 Japan (international vehicle registration).
3》 Physics joule(s).
4》 (in titles) Journal (of).