亖
1. Ancient character meaning "four."
古同“四”。
2. It is a pictographic character. The shape of the oracle bone script resembles a trunk exhaling and inhaling. Its primary meaning is a number (three plus one equals four), which is the same as the original meaning.
指事。甲骨文字形,象鼻子喘息呼气之形。本义:数目。三加一所得)同本义
3. In the gongche notation (a system for notating music), one of the musical notes is called "Dalu" (大吕), and "Dazhu" (大簇) uses the character for four.
工尺谱中音名之一大吕、大簇用四字。——《宋史·乐志十七》
4. In ancient times, a vehicle with four horses was called "sì" (驷). Officials at court should not have partiality, and military leaders should not engage in favoritism. Therefore, it is forbidden to have four followers; it is not allowed to carry unusual troops.
古代一车四马称“驷”人臣处国无私朝,居军无私交…是故不得四从;不载奇兵——《韩非子》