There isn't one word for all that in English.
A clenched hand/ fist. Source: Dictionary.com
Yes, the word 'fist' is a noun, a singular, common, concrete noun; a word for a hand with tightly closed fingers, a word for a thing. The word 'fist' is also a verb; to strike or grasp with a clenched hand.
Fist: nounThe hand with its fingers bent and closed down into the palm.The hand clenched with the fingers down into the palm.
Another word meaning clenched is tighten.
Here is an example sentence with the word 'angry':I sensed that Samuel was angry when he clenched his fist and gritted his fist in frustration.
I muttered to myself "I hate pie."
Brouhaha which means a fist to fist compile, or fight. Yes, it is a real word!
That is the correct spelling of "clenched" (closed, tightened).
The child clenched her dad's hands in fear when the lion in the zoo roared
Surfaced
There is no word for tekk, but tek means "iron", that's why Tekken means Iron Fist, which fits the story for the Iron Fist Tournament.
The meaning of the word box, as a noun, is a container like a cube, constructed from wood, cardboard, metal, etc. As a verb this word means to fight with clenched fists. That is the meaning of the word box.