Trishul is the name of a short range surface to air missile developed by India as a part of the Integrated Guided Missile Development Programme. It has a range of 9 km and is fitted with a 5.5 kg warhead. Trishul flies in supersonic speed and has a low altitude sensitive radio altimeter and height lock loop control on board, to skim over the sea at a very low altitude and hit against sea skimming missiles coming towards our ships.

Actually, the locomotor part of a hydra is not its tentacles. Hydras move by a remarkable way called "looping." They attach one end of their body to a surface and then release the other end, allowing it to move and attach again. This looping movement is facilitated by the contraction and expansion of the body, rather than the use of tentacles. Tentacles are specialized structures primarily used for feeding and defense in hydras.

The Prithvi missile is a family of tactical surface to surface Short-Range Ballistic Missiles (SRBM) and is India’s first indigenously developed ballistic missile. Development of the Prithvi began in 1983 and it was first test-fired on 25th February, 1988 from Sriharikota, SHAR Centre, Potti Sreeramulu Nellore district, Andhra Pradesh.

It has a range of upto 150 to 300 km. The land variant is called Prithvi while the naval operational variant of Prithvi I and Prithvi II class missiles are code-named Dhanush (meaning Bow). All missiles programme under DRDO.