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(nasm.info)Section 6.5.4

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6.5.4. `elf' Extensions to the `COMMON' Directive
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   `ELF' also allows you to specify alignment requirements on common
variables. This is done by putting a number (which must be a power of
two) after the name and size of the common variable, separated (as
usual) by a colon. For example, an array of doublewords would benefit
from 4-byte alignment:

     common  dwordarray 128:4

   This declares the total size of the array to be 128 bytes, and
requires that it be aligned on a 4-byte boundary.