Fields
UNDEFINED = 0,
The symbol record is not yet assigned a section. A value of zero indicates that a reference to an external symbol is defined elsewhere. A value of non-zero is a common symbol with a size that is specified by the value.
ABSOLUTE = 65535,
The symbol has an absolute (non-relocatable) value and is not an address.
DEBUG = 65534,
The symbol provides general type or debugging information but does not correspond to a section. Microsoft tools use this setting along with .file records (storage class FILE).