SO-DIMM

from The Free On-line Dictionary of Computing (8 July 2008)

Small Outline DIMM
SO-DIMM

   <storage> (SO-DIMM) A smaller kind of {DIMM} with 72 pins
   (supporting 32-bit transfers) or 144 pins (64-bit transfers).
   Regular DIMMs have 168 pins and support 64-bit transfers.
   Being roughly half the size of the regular DIMM, SO-DIMMs are
   often used in {notebook computers}.

   Kingston Memory Guide
   (http://kingston.com/tools/umg/newumg05a.asp).

   (2001-02-16)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

SODIMM
       Small Outline Dual Inline Memory Module (DRAM, DIMM)