I love using vim's digraphs to insert unicode symbols into my text documents. I've memorized a lot of the more frequent ones that I type but I often end up looking up new ones or ones I've forgotten. I used to use:
:digraphs
to display a giant table of all of the digraphs. There sorted by unicode so they're in a roughly coherent order, but there's a lot to look at, and it's just the raw symbols.
Recently I found a much better way. By typing
:help digraphs
you can pull up the digraphs help page which contains a more thorough list of all digraphs including English unicode symbol names. For example I can hit /ditt to find the line:
〃 +" 3003 12291 DITTO MARK