An esoteric programming language.
HQ9+ has a simple instruction set allowing for
common programming examples to easily created.
The instruction set:
does not appear to define the effect
of a character
outside the instruction set.
As should be obvious, this language is not serious.
It is more of a satire of those extremely common example programs.
As for the + operator, in the example implementation
of the language at its "offical" website, is pretty
much ignored, since its effect is totally unnoticable.
Primary Source/See Also: http://www.cliff.biffle.org/esoterica/hq9plus.html
-- the language's homepage.