suffix, counter
counter for poles, rods, etc.
Used as a suffix attached to numerals to count long, slender objects such as poles, fishing rods, bamboo poles, or flagpoles. Not a general counter for sticks or bars; limited to specific pole-like items.
釣り竿を二竿買った。
I bought two fishing rods.
旗竿が三竿並んでいる。
Three flagpoles are lined up.