I have seen in many temples there are Nandi and tortoise facing the Shiva linga. what is the story of being tortoise facing the Shiva linga?
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A tortoise in front of lord Shiva's idol symbolically signifies two reasons :-
As we know that when you try to touch or harm a tortoise, it will take his legs and head inside his shell, hence this signifies that even humans should withdraw all his senses from our material world, which in Hindi we say Moh-Maya nahi rakhni chahiye.
Its the way that tortoise hatches its eggs, they don't sit over their eggs to hatch, instead they constantly look at them, and hence it is kept facing lord shiva which signifies that one should concentrate while praying the god.
Apart from that, turtle also has a remote relation with lord Shiva (Not relation to turtles in front of lord Shiva idol)
As we know, lord Shiva is always portrayed in a Yoga pose, so in yoga, we do have Kurmasana (Tortoise Pose)
Image Credits : Yoga Journal
According to me, there are any script reference over this, its we people who believe keeping a tortoise in front of lord Shiva's idol.