About Tara, the Shakti of Avalokiteshvara
In Mahayana Buddhism, the male principle was worshipped first in the 7th century however the female principle was introduced in Buddhism in the form of Tara. First, she was known in two forms: her forms increased to 21. White Tara came to be regarded as Shakti of Avalokiteshvara. The system of worshipping her came to Nepal from Tibet where she holds a high position in Lamaism. White Tara and Green Tara can be distinguished by their symbols. The symbol of White Tara is a full-blown lotus while that of Green Tara is a water lily (utpala) with petals closed. The former represents day and the latter, night.