"The lingam (also, linga, ling, Shiva linga, Shiv ling, Sanskrit लिङ्गं, liṅgaṃ, meaning "mark", "sign", "inference" or is a representation of the Hindu deity Shiva used for worship in temples. In traditional Indian society, the linga is rather seen as a symbol of the energy and potentiality of the God.
The lingam is often represented alongside the yoni, a symbol of the goddess or of Shakti, female creative energy. The union of lingam and yoni represents the "indivisible two-in-oneness of male and female, the passive space and active time from which all life originates" (Wikipedia)