What does pink symbolize?

Women's rights. As in Code pink in Berkeley which is a women's activist group, and also the Breast cancer symbol, and baby girls.

Pink symbolizes purity and femininity.
Magically speaking

Pink is the colour we most often connect with romance.

Used for love, friendship, harmony, compassion, relaxation and companionship.

Pink is symbolic of gentle emotions and of emotional unions.

Western society often links pink with very young female children and has recently been used in the pink ribbon breast cancer campaign.

Use it in Magic spells of protection and unconditional love.

The Psycology of Colour says

Positive: Physical tranquility, nurture, warmth, femininity, love, sexuality, survival of the species.

Negative: Inhibition, emotional claustrophobia, emasculation, physical weakness.

Being a tint of red, pink also affects us physically, but it soothes, rather than stimulates.