The former ticker symbol of the Nasdaq 100 Trust.

Also known as "cubes" or the "quadruple-Qs," the symbol is now QQQQ. This is an exchange-traded fund that essentially allows investment in all the stocks of which the Nasdaq 100 is composed through investment in a single security. Since the Nasdaq 100 Index includes the 100 non-financial stocks that are largest and most actively traded, the QQQQ provides exposure to the technology industry.