copyright character in vim

I used to get this copyright symbol in vim earlier through some keys' combination. Can someone help me with it now? I simply fail to recollect it.

Also, if possible, share some more of such characters... someone might need it sometime.

From stackoverflow

• any help here?

  © for the copyright character

• Ctrl-K Co

  Should do it

• :digraphs

  shows the list of digraphs you can use. I see the copyright symbol as number 169, which has a key combo of "Co". To recreate that in edit mode, hit Ctrl+k, then type "Co", and you should have a copyright symbol.