https://www.jetbrains.com/help/idea/2016.3/symbols.html#d1784129e12
Common
| Icon | Description |
|---|---|
 | Class |
 | Abstract class |
 | Annotation |
 | Enumeration |
 | Exception |
 | Final Java class |
 | Interface |
 | Java class that contains declaration of the main() method. |
 | Test case |
 | Java class located out of the source root. Refer to the section Configuring Content Roots for details. |
 | Java class excluded from compilation. |
 | PHP trait |
 | Method |
 | Abstract method |
 | Field |
 | Variable |
 | Property |
 | Parameter |
 | Element |
 | Directory |
 | Module |
 | Group of modules |
 | Package |
 | Source root |
 | Test root |
 | Excluded root |
 | Resources |
 | Test resources |
 | Generated source roots |
 | Generated test source roots |
| Visibility modifiers | |
 | Read-only class, e.g. from a jar of an external library. |
 | private |
 | protected |
 | package protected |
 | static |
 | public |
for DB2.
