Triple glazing is 3 seperate panes of glass, seperated by 2 air gaps. The individual panes of glass may be "laminated" glass though.
Argon is only sometimes used in insulated glass unit (two panes of glass sealed together, usually with an air gap of 12mm or less) as it reduces heat transmission through the glass unit. I reckon 99% of the insulated glass units being sold to the residential market, being labelled for acoustic purposes, would just have normal air inside them. But that being said, glass is crap for stopping low frequencies anyway unless you start using thick monolithic glass, and then laminating it to thinner panes of glass or polycarbonate to help dampen resonances and higher frequencies, but then it starts to get ridiculously expensive.