A product icon theme for Visual Studio Code that relabels the symbol icons so that C symbols are easy to tell apart in Call Hierarchy, Find All References, Symbol Search (Ctrl+T), Outline, Breadcrumbs and the suggestion widget.

Most symbol kinds share confusingly similar default glyphs. This theme gives each kind a clear lowercase initial (vectorised from Segoe UI) or an idiomatic mark (# for macros), so you can scan a reference list by glyph alone. Where your color theme defines symbol colors (symbolIcon.*Foreground), the glyphs are tinted automatically — functions purple, structs orange, variables blue, and so on.

Glyphs

Symbol kind (codicon)	C meaning	Glyph
`symbol-function`	function	`f`
`symbol-class`	`typedef`	`t`
`symbol-variable`	variable	`v`
`symbol-struct`	`struct`	`s`
`symbol-field`	struct field	`sf`
`symbol-enum`	`enum`	`e`
`symbol-enum-member`	enum constant	`ec`
`symbol-constant` / `symbol-string`	`#define` macro / `const`	`#`
`symbol-module`	translation unit	a package cube

Any symbol kind not listed above keeps its default VS Code (Codicon) glyph.

Notes on a couple of mappings

typedef — C language servers report typedefs as the Class kind (symbol-class), so the t glyph maps through symbol-class. C has no classes, so in C this is effectively the typedef icon.
macros — some C language servers report #define macros as the String kind, so symbol-string is mapped to # as well (this also affects string symbols in other languages, since product icon themes are global).

Install & activate

Install the extension.
Run Preferences: Product Icon Theme from the Command Palette (Ctrl+Shift+P) and pick C Icon Theme — or set it directly:
```
"workbench.productIconTheme": "c-symbols"
```

Notes

Product icon themes are global in VS Code: they apply to every language, not only C. This theme is designed around C symbol kinds, which is where it helps the most.
Icon colors come from your color theme (symbolIcon.*Foreground); this theme only changes the shapes. Want the gray kinds colored too? Override them in your settings, e.g. "workbench.colorCustomizations": { "symbolIcon.constantForeground": "#4EC9B0" }.
The Go to Symbol quick pick (Ctrl+T) renders symbol icons without color on VS Code ≤ 1.123 (vscode#299650); this is fixed in VS Code 1.124. Other views (Outline, Call Hierarchy, …) are colored on all versions.

Build from source

The font is generated from the SVGs in icons/:

npm install
npm run build      # icons/*.svg -> theme/fonts/c-icons.woff + the theme JSON

build/gen-badges.mjs vectorises the lowercase letter glyphs (t, f, v, s, sf, e, ec) from Segoe UI at a fixed x-height into icons/*.svg.
build/build-font.mjs assigns each icon a Private-Use-Area codepoint and rebuilds theme/fonts/c-icons.woff and theme/c-product-icon-theme.json, including the macro alias.