You use it when you are bored as a word to type on google or a search engine by typing every letter/symbol from right to left and repeating it with 'Shift' key.
You can search `1234567890=QWERTYUIOP#ASDFGHJKL;'\ZXCVBNM,./¬!"£$%^&*()_+qwertyuiop{}~asdfghjkl:@|zxcvbnm<>? in google.