Hey MR fans, I just wanted to share a simple way I added scientific symbols to my iPad and iPhone. You can copy Unicode characters from an app (I used Unicode Pad from the App Store), the web, emails, etc.. Once copied, go to Settings>>General>>Keyboard and paste the copied symbol into your Keyboard Shortcuts. This of course, is easier than learning iOS in Xcode, developing an alternate keyboard, and importing it to your device. It's much easier IMO than copy/paste between apps. I've included an iPad screen shot for some suggestions. Btw, "fs" is my fave. 
