In cjk characters set, full width space has the unicode value is U+3000, the english space unicode (half width space) value is U+0020.
How to input full width space in Vim?
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The digraph for
IS, which you can enter with
CTRL-K IS. If you prefer to use a different digraph, you can assign one with:
dig ?? 12288
12288 is the decimal equivalent of 0x3000. Or, you can make a map, e.g.,
inoremap <c-l> <c-k>IS
You can enter arbitrary unicode using
CTRL-V u3000 (see