also: しほん
noun
four (long cylindrical things)
Counter for four long, cylindrical objects such as bottles, pens, trees, or rolled items. The reading よんほん is standard; しほん is rare.
冷蔵庫にビールが四本ある。
There are four bottles of beer in the fridge.
鉛筆を四本ください。
Please give me four pencils.
Compound of 四 (four) and the counter 本 (ほん), used for long cylindrical objects. The reading よんほん follows regular numeral-counter combination rules.