[ramses0]

Usually a/b/c but sometimes f/function, k/key, v/value... just a simple mnemonic.

To really blow your mind:

    i<c-r>%

    V:!ls<cr>

Then you start playing with marks a little bit with a similar concept (eg: ma, mb, mc, 'a, 'b, 'c), and the good friend `gi` (go back to previous insert position)...

It's again, esoteric, but as you use it more, it becomes less esoteric and more just another part of your vim vocabulary (:help search-offset, fellow traveler).