The breast evolved from the sweat gland to produce milk, a nutritious secretion that is the most distinctive characteristic of mammals, along with live birth.In mature women, the breast is generally more prominent than in most other mammals; this prominence, not necessary for milk production, is probably at least partially the result of sexual selection.Alchemists constructed the symbol from a circle (representing spirit) above an equilateral cross (representing matter).Womanhood is the period in a female's life after she has passed through childhood and adolescence, generally around age 18.
Whether or not a child is considered female does not always determine whether or not the child later will identify themselves that way (see gender identity).
In particular, previously common terms such as office girl are no longer widely used.
Conversely, in certain cultures which link family honor with female virginity, the word girl is still used to refer to a never-married woman; in this sense it is used in a fashion roughly analogous to the obsolete English maid or maiden.
It is a stylized representation of the goddess Venus's hand-mirror or an abstract symbol for the goddess: a circle with a small equilateral cross underneath.
The Venus symbol also represented femininity, and in ancient alchemy stood for copper.