The Engineering Keyboard is a free Android mobile application that provides access to a wide range of engineering symbols and operators. With this keyboard, you can type anything from superscript exponents to triple line integrals.

One of the best features of the Engineering Keyboard is the ability to add real superscripts and subscripts to any variable you want, allowing you to square, cube, and more. Additionally, you can type complex integration symbols, from a standard integral all the way to a triple closed path integral.

The Engineering Keyboard also allows you to 'vectorize' any character you want, with vector arrows and unit vectors. Plus, you can type i, j, and k unit vector symbols and X, Y, and Z bar characters with shortcut keys. Installation is easy, simply install the Engineering Keyboard application, go to your phone settings, select 'Languages & Input', choose 'Virtual Keyboard', and turn on 'Engineering Keyboard'.

Overall, the Engineering Keyboard is a must-have for any engineer or student who needs quick access to engineering symbols and operators on their Android device.