female sterilization is commonly referred to as tubectomy. Tubectomy is a surgical procedure in which a woman's fallopian tubes are blocked, cut, or sealed to prevent eggs from reaching the uterus for fertilization. This method of permanent contraception is also known as tubal ligation.

Manikya, also known as ruby, and sapphire are gemstones that are forms of the mineral corundum. Corundum is not an oxide but rather a crystalline form of aluminum oxide (Al₂O₃). Both ruby and sapphire are varieties of corundum, with ruby being red due to the presence of chromium impurities, and sapphire coming in various colors, except red (which would be classified as ruby), often due to different trace elements.

A torch emits a divergent light beam, where light rays spread out as they move away from the source. This spreading allows the flashlight to illuminate a wider area, making it useful for various tasks. Divergent beams are common in flashlights, ensuring efficient coverage and visibility in the dark.

Garden Reach Shipbuilders and Engineers Limited (GRSE) is one of India’s leading shipyards, located in Kolkata, West Bengal. It builds and repairs commercial and navals vessels. Founded in 1884 as a small privately owned company on the Eastern Bank of the Hughly river, it was renamed as Garden Reach Workshop in 1916. The company was nationalised by the Government of India in 1960.