concatenation shouldn't use '+'

I would like people to consider using another symbol
for concatenating.

It is my experience that one can have classes for
which adition as well as concatenation feel as
natural operations for the class. But since
both use the "+" operator one then has to either
use a different symbol for one of the two operations
or do one operation via methods, both feel awkward
and break consistency.

-- 
Antoon Pardon