ji 地 ( じ ) - area between the hamon and the shinogi on a Japanese sword blade

jindai moji 神代文字 ( じんだいもじ ) - form of writing possibly used before the adoption of Chinese characters

jingasa 陣笠 ( じんがさ ) - flattened, wide brimmed helmet

jissen 実戦 ( じっせん ) - real combat; realistic fighting

jizamurai 地侍 ( じざむらい ) - provincial warrior who would return to farm his land while in peacetime

joshi goshinjutsu 女子護身術 ( じょしごしんじゅつ ) - women's self defense

jou 杖 ( じょう ) - staff usually about 4 feet in length

juudou 柔道 ( じゅうどう ) - judo

juujutsu 柔術 ( じゅうじゅつ ) - method of close combat, unarmed or using weapons

juunan undou 柔軟運動 ( じゅうなんうんどう ) - flexibility exercises

juutaijutsu 柔体術 ( じゅうたいじゅつ ) - term used to describe methods of throwing an opponent using the body