３件
How to write Japanese & Stroke order

Check also 件  

Names and idioms with total stroke of 6:
江  七十七  入木  山三  うし山  

Names and idioms similar to ３件:
一件落着  重要案件  初期条件  条件式  貿易条件  

Check stroke order for the words below:
医師  御射鹿池  英語版  証太  端早田  麁服