Question

₩ is the currency symbol for North Korea. Its Unicode code-point is U+20a9.
In insert mode, I can press Ctrl–V u20a9 to type it.
If I only know its UTF-8 form e2 82 a9, how can I type it easily?

Answer 1

Same solution with a twist of automation to help remember it:

command! -nargs=* UTF8 call EncodeUTF8(<f-args>)
fun! EncodeUTF8(...)
   let utf8str = ""
   for i in a:000
      let utf8str .= "\\x" . i
   endfor
   exe "norm i" . eval("\"".utf8str."\"")
endfun

Now you can :UTF8 e2 82 a9

You can also type this particular character with <C-k>W=. See :help digraph-table-mbyte.

Note that you can also get information about a character with ga and g8 in normal mode. So it might be easier to just do <C-r>="\xe2\x82\xa9" once and then do ga to get the code-point.