fist
拳 centers on the hand closed tightly into a fist, used for striking or as a symbol of martial power.
拳 combines 龹 (a phonetic component related to rolling or curling) with 手 (hand), suggesting a hand curled into a fist.
The top 龹 looks like a rolled-up scroll, and the bottom 手 is a hand. Imagine rolling your hand into a tight scroll-like shape: that's a fist.
For ケン, picture a karate master named Ken clenching his fist: Ken -> ケン, and his fist is ready to strike.
fist
pistol; handgun
tightly clenched fist
Tekken (video game series and media franchise)
Chinese martial arts; kung fu; wushu; quanfa
grand ultimate fist; Tai Chi Chuan
(clenched) fist; knuckles
pinky swear (i.e. linking little fingers to confirm a promise); pinky promise
Shorinji Kempo (modern Japanese martial art based on Shaolin kung fu)
boxing
clenched fist
rock! paper! scissors!; paper! scissors! rock!; one! two! three!
both fists
Chinese martial art
Wu Xing Fist; Five Form Fist (Dragon, Snake, Tiger, Crane, Leopard)
flare gun; Very pistol; signal pistol
bajiquan (Chinese martial art)
neijia (Chinese martial arts style); internal martial arts
clenched fist
Fist of the North Star (manga series and media franchise; written by Buronson and illustrated by Hara Tetsuo)