Still another theory posits that the symbol was used as an abbreviation for amphora, a unit of measure corresponding to the amount of liquid contained in a vessel of the same name.

• 还有另一种理论断定，这个符号被用作一个缩写词，amphora表示（古希腊和罗马的）双耳洒罐，是一个相当于同名容器容纳的液体数量的度量单位。