as: COFF Symbols

 
 5.5.4 Symbol Attributes for COFF
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 The COFF format supports a multitude of auxiliary symbol attributes;
 like the primary symbol attributes, they are set between '.def' and
 '.endef' directives.
 
 5.5.4.1 Primary Attributes
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 The symbol name is set with '.def'; the value and type, respectively,
 with '.val' and '.type'.
 
 5.5.4.2 Auxiliary Attributes
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 The 'as' directives '.dim', '.line', '.scl', '.size', '.tag', and
 '.weak' can generate auxiliary symbol table information for COFF.