Ok, lets first lookup the character we want with unicode:
x61:~% unicode -r peace U+262E PEACE SYMBOL UTF-8: e2 98 ae UTF-16BE: 262e Decimal: ☮ ☮ Category: So (Symbol, Other) Bidi: ON (Other Neutrals) U+4DCA HEXAGRAM FOR PEACE UTF-8: e4 b7 8a UTF-16BE: 4dca Decimal: ䷊ ䷊ Category: So (Symbol, Other) Bidi: ON (Other Neutrals)
The important element is the U+262E part, which is the Unicode codepoint.
Now into insert the PEACE SYMBOL, in INSERT MODE type:
[Ctrl]+[v], [u], , , , [E]
If you can't see the inserted character, try
gvim. Also try place the cursor over the character an use
ga shortcut to examine the character underneath the cursor.
ga might report something like:
<?> 9774, Hex 262e, Octal 23056
Understand the Hexadecimal is the key to the codepoint.