It can detect hooks on any function, not just PLT. It seems that it is done by scanning the prologue of functions to see if it jumps to a location outside the binary; the app developer needs to call this check manually (this is quite an expensive operation), which is usually done bef...
Our tip to quickly find an icon in the big list of Font Awesome icons is to use the search function of your browser, and to look for words similar to the icon you would like to find. There are most likely icons available for your needs, but that are called (in English only) with ...