四,甲骨文中写作长短相等的四横。三为三等横,四便是四等横。金文、小篆至今写作口(即围字)中间一个八字。就像匹字,“匚”字中间一个“八”字,《说文解字》:“匹,四丈也。从八、匚,八揲一匹,八亦声。”即是分成八个折叠,藏入匣中,成为一匹。八,分也,四丈分割为一匹也。四字的中间也是一个八字,四便是对一个 Fourth, the length of writing in Oracle four horizontal. Three for the third cross, four is the fourth cross. Jinwen, Xiaozhuan writing mouth (ie Wai words) in the middle of a character. Like a match, the word “” in the middle of the word “说 wenzi”: ",, 四丈 也. From 八, 匚, 八 揲 一, 八 也 声. That is divided into eight folded, hidden in the box, into one. Eight, points also, four feet divided into one also. The middle of the word is also a character, four is a right