also: じっぽん
noun
Counter for long, cylindrical objects such as bottles, pens, trees, or fingers. Used with the native Japanese number system.
ペンを十本ください。
Please give me ten pens.
ビールを十本買った。
I bought ten bottles of beer.
Compound of 十 (ten) and the counter 本 (ほん), which becomes ぽん due to rendaku. The reading じゅっぽん is a common colloquial variant of じっぽん.