３件
How to write Japanese & Stroke order

Check also 件  

Names and idioms with total stroke of 6:
弔う  丸山  寺  井乃  よし々  

Names and idioms similar to ３件:
条件  人件費  先行条件  大阪朝日新聞筆禍事件  子供年齢条件追加特約  

Check stroke order for the words below:
処す  未然形  東與那覇  斑黄葵  召し出す