What do Pint glass / Beer glass Lettering and numbering mean ???

What do the numbers/letetring on a European pint/beer glass mean ?
I have many beer drinking glasses from Ireland and Germany. Some pint, some fluted, some weiss beer.. etc. I notice various numbering.. -->
Pint
06
~
04

and

SQHM
_____
0, 4l

What do these numbers/letters mean?
Update: I really looking for what
' ' SQHM ' 'means..!!!
2 answers 2