How do I insert special Unicode characters using digraphs in Vim?

Explanation

Vim's digraph system lets you insert special characters by pressing <C-k> followed by a two-character mnemonic code. This provides quick access to hundreds of Unicode characters — arrows, math symbols, accented letters, and more — without needing to look up character codes.

How it works

• <C-k>{char1}{char2} — insert the digraph character
• Two characters map to a specific Unicode character
• Works in insert mode and command-line mode
• Vim comes with hundreds of predefined digraphs

Example

In insert mode:
<C-k>DG → °  (degree sign)
<C-k>-> → →  (right arrow)
<C-k>OK → ✓  (checkmark)
<C-k>XX → ✗  (cross mark)
<C-k>12 → ½  (one half)
<C-k>co → ©  (copyright)
<C-k>Eu → €  (euro sign)

Tips

• :digraphs lists all available digraphs with their codes
• Define custom digraphs: :digraph <3 9829 (♥ = heart)
• Use ga on any character to find its digraph code
• For characters not in digraphs, use <C-v>u{hex} to enter by Unicode code point