noun
third stage; three stages
Used for a third step or phase in a process, or for something consisting of three stages.
計画は三段に分かれている。
The plan is divided into three stages.
三段の棚を買った。
I bought a three-tier shelf.
noun
third dan
Refers to the third rank in martial arts (judo, karate, etc.), go, shogi, and similar grading systems.
彼は柔道三段だ。
He holds a third dan in judo.