How do I replace a visual block selection with digraph or special characters?
<C-v>jjr<C-k>12
Visual block mode combined with the replace command and digraph input lets you replace a column of characters with special Unicode characters.
Tag: digraph
How do I insert special Unicode characters using digraphs in Vim?
<C-k>DG
Vim's digraph system lets you insert special characters by pressing followed by a two-character mnemonic code.