《宋史·列传·卷一百一十七》
五百人为一部，部将用牌子写上其属下十位正副队将的姓名。
二千五百人为军，统制官以牌书部将正副十人姓名。
An army division consisted of 500 men, and the division commander would write the names of ten team leaders and deputy team leaders who report to the division commander on a sign.