Code
//inc -su $+(%,count.,$me) | echo -a $eval( $+(%,count.,$me) ,2) or %count. [ $+ [ $me ] ]


see also https://en.wikichip.org/wiki/mirc/variables#Dynamic_Variable_Names

FYI, if you switch to using a hashtable instead of global variables, you can access the item the same way you created it, without all the [ dynamic ] stuff.

//hinc -smu tablename $+(count.,$me) | echo -a $hget(tablename, $+(count.,$me) )