Dear friends,
I have a question regarding the significance of the Shiva Linga. I have found this description:
Shiva Linga is a wide spread Indian Phallic figure. It consists of a feminine base ‘Yoni’ or ‘vagina’ and a rising masculine portion ‘the Phallus’ or ‘penis.’ The Linga artifacts, dating from the first century BC to the third century AD, are shaped like realistic ‘Phalli’. Thereafter the shape becomes progressively more abstract. By medieval times, its observable portion, rising from the Yoni, forms a round block with domed apex.
http://www.vepachedu.org/linga.htm
With this it seems that both the Yoni and Linga are depicted.

This is perhaps symbolic of the indivisible union of Shiva and Shakti and is reminiscent of the Yab-Yum within Vajrayana.

Beyond being an object of veneration, is there a meditative significance, or instruction, for Shaivite contemplatives?

Namaste