The Sharp _<A HREF="https://wikipedia.org/wiki/Sharp_Zaurus">Zaurus_</A>
PDA, a fully functional Linux-based handheld computer.  
This was real Linux, long before Android's locked-down 
flavor rose to dominate the handheld domain.
I owned two of the clamshell models and happily tapped out
Unix commands on both, before the OQO came along (see 
_<A HREF="2006%20Doused%20OQO.JPG.html">2006_</A>).