To easier the use of icons in QGIS manuals, replacements are defined for each icon in /source/conf.py file at QGIS-Documentation repository and some of these substitutions are listed below. Thus, when you want to use an icon from QGIS application in the documentation there is a big chance that there is already a substitution that can/should be used.
If no replacement exists:
.. |splitLayer| image:: /static/common/split_layer.png
   :width: 1.5em
Below are given some icons and their substitution to use when writing documentation. Can be used/found in many places in manuals.
| Icon | Substitution | 
|---|---|
![]()  | 
|kde| | 
![]()  | 
|nix| | 
![]()  | 
|osx| | 
![]()  | 
|win| | 
| Icon | Substitution | Icon | Substitution | 
|---|---|---|---|
![]()  | 
|saveEdits| | ||
![]()  | 
|undo| | ![]()  | 
|redo| | 
![]()  | 
|editCopy| | ![]()  | 
|editPaste| | 
![]()  | 
|editCut| | 
| Icon | Substitution | Icon | Substitution | 
|---|---|---|---|
![]()  | 
|expandTree| | ![]()  | 
|collapseTree| | 
![]()  | 
|expandNewTree| | ![]()  | 
|propertyItem| | 
![]()  | 
|deselectAll| | ![]()  | 
|editCopy| | 
![]()  | 
|filePrint| | ![]()  | 
|propertiesWidget| | 
Icons used in Composer:
Icons used in Layer Properties dialog:
Standard provided with basic install, but not loaded with initial install
| Icon | Substitution | Icon | Substitution | 
|---|---|---|---|
![]()  | 
|grass| | ||
![]()  | 
|grassTools| | ![]()  | 
|grassNewMapset| | 
![]()  | 
|grassOpenMapset| | ![]()  | 
|grassCloseMapset| | 
![]()  | 
|grassRegion| | ![]()  | 
|grassSetRegion| | 
| Icon | Substitution | Icon | Substitution | 
|---|---|---|---|
![]()  | 
|eventBrowser| | ![]()  | 
|eventId| | 
![]()  | 
|evisConnect| | ![]()  | 
|evisFile| |