Where is 'tuple' in the language reference

[Lutger Blijdestijn]

Steve Teale wrote:

> I see the term used, but I can't find where it is defined.

It's here: http://www.d-p-l.org/template.html#variadic-templates

"A Tuple is not a type, an expression, or a symbol. It is a sequence of any 
mix of types, expressions or symbols."

The language terminology is easily confused with the constructs that phobos 
defines, where TypeTuple and Tuple mean different things.