counter
counter for long, thin things (e.g. swords, pens)
Used specifically for long, slender objects such as swords, pens, pencils, and sometimes branches. Not a general counter for all thin items.
この刀は一振り、いや一枝の名刀だ。
This katana is one fine sword—no, one fine blade.
鉛筆を三枝ください。
Please give me three pencils.