nvim/Q/What does it mean when a W appears next to the line number in a document?

• What does it mean when a W appears next to the line number in a document in nvim?

  • Answer

    • AI/Response
      • The W is the default sign-column marker for a warning-severity diagnostic from Neovim’s diagnostics system (vim.diagnostic). It usually comes from an LSP server, linter, or another tool that reports diagnostics into a buffer.
      • Neovim defines default sign text per severity: E (error), W (warn), I (info), H (hint). So W specifically means WARN, not (for example) a modified file flag.
      • The symbol appears in the sign column (gutter). If your UI shows the number column and sign column together, it sits beside the line numbers, which is why it reads as “next to” the line number.
      • Useful built-ins: move between diagnostics with ]d / [d; open the full message with vim.diagnostic.open_float() (often bound in configs); customize or hide signs via vim.diagnostic.config() (see signs.text per severity).

      • Sources

        • Neovim help: Diagnostic signs (default E/W/I/H)
        • Neovim help: vim.diagnostic / severity