also: ジェイ
J; j
The letter J itself, used in contexts like alphabet listing, abbreviations, or as a symbol.
アルファベットのＪは、ジェーと読む。
The letter J in the alphabet is read as 'jei'.
Abbreviation prefix for Japan, as in Jリーグ (J.League) or J-POP.
See also: ジャパン
Ｊリーグは日本のプロサッカーリーグだ。
The J.League is Japan's professional soccer league.
joule
Counter for joules, the unit of energy.
See also: ジュール
この仕事には100Ｊのエネルギーが必要だ。
This work requires 100 joules of energy.
tatami mat counter
Used on floor plans to count tatami mats as a measure of room size (approx. 1.82 sqm or 1.54 sqm).
See also: 畳
この部屋は６Ｊの広さです。
This room is 6 tatami mats in size.
J.League
Colloquial abbreviation for J.League (Japan Professional Football League).
See also: Ｊリーグ
今年のＪは混戦だ。
This year's J.League is a close contest.
This battery can store 500 joules of energy.
彼はＪ２のチームでプレーしている。
He plays for a team in J2.
ジュール is the full katakana word for the energy unit joule, while Ｊ is the symbol/counter used in measurements.
Ｊリーグ is the full official name of Japan's professional football league, while Ｊ alone is the colloquial shortening used in casual speech.
Standard fullwidth uppercase form for the letter J.
Alternate reading ジェイ, also used for the letter J.
Fullwidth lowercase variant; less common than uppercase.
From the Latin letter J, used in various abbreviations and symbols. The reading ジェー/ジェイ reflects the English pronunciation of the letter.