noun, noun, used as a suffix
Only with reading せき
Refers to a physical barrier, gate, or checkpoint, especially historical ones on roads. Also used as a suffix in words like 関所 (checkpoint) or 税関 (customs).
昔、旅人は関で通行手形を見せなければならなかった。
In the old days, travelers had to show a pass at the barrier.
税関で荷
My luggage was inspected at customs.
noun
seki; mutual life
A Go term for a position where neither player can capture the other without losing their own stones, resulting in a local stalemate. Usually written in katakana.
この形はセキになるので、どちらも打てない。
This shape becomes seki, so neither side can play there.
The kanji 関 originally depicts a gate or barrier. The Go term seki is a borrowing from Japanese into English Go terminology.