There are many stories surrounding this claim. In Mahabharata shantiparva chapter 289 verse 18, it is mentioned

आनतेनाथ शूलेन पाणिनामिततेजसा।
पिनाकमिति चोवाच शूलमुग्रायुधः प्रभुः।।

The Lord Shiva pressed his trident ( त्रिशूल) with his hand and thus the trident becomes a bow (धनुष) called as “पिनाक”

One name of lord shiva known as “पिनाकी” is derived based on this पिनाकोऽस्त्यस्येति ( the one who have “पिनाक”


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