(as.info) bss

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 bss Section
 ===========
 
    The bss section is used for local common variable storage.  You may
 allocate address space in the bss section, but you may not dictate data
 to load into it before your program executes.  When your program starts
 running, all the contents of the bss section are zeroed bytes.
 
    The `.lcomm' pseudo-op defines a symbol in the bss section; see
  `.lcomm' Lcomm.
 
    The `.comm' pseudo-op may be used to declare a common symbol, which
 is another form of uninitialized symbol; see  `.comm' Comm.
 
    When assembling for a target which supports multiple sections, such
 as ELF or COFF, you may switch into the `.bss' section and define
 symbols as usual; see  `.section' Section.  You may only assemble
 zero values into the section.  Typically the section will only contain
 symbol definitions and `.skip' directives ( `.skip' Skip.).
 

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