1, The full form of In is Input. It’s used on Academic & Science ,Electronics in Worldwide

Input is the term denoting either an entrance or changes which are inserted into a system.

2, The full form of In is Indium. It’s used on Academic & Science ,Chemistry in Worldwide

Indium is a chemical element with the symbol In and atomic number 49. This rare, very soft, malleable and easily fusible post-transition metal is chemically similar to gallium and thallium, and shows the intermediate properties between these two. Indium was discovered in 1863 and named for the indigo blue line in its spectrum that was the first indication of its existence in zinc ores, as a new and unknown element. The metal was first isolated in the following year. Zinc ores continue to be the primary source of indium, where it is found in compound form.