symbol data
Compiler-generated information that identifies functions by name. It is typically stored in a module, in .pdb or .dbg files associated with the module, or in .map files.
Debug symbol data is used to identify functions in native-compiled (unmanaged) code. If symbol data is not available for a function, the function is labeled ??? in error data views, or UnnamedFunction@<offset> in other data views.
For more information about symbol data, refer to the documentation for Microsoft Visual Studio.
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