The symbol for the Nasdaq composite index is ^IXIC, COMP, $COMP, ^COMP or .COMP on most systems. The ticker symbol for Nasdaq Stock Market (the corporation that runs the exchange itself) is NDAQ and, not surprisingly, it trades on the Nasdaq.
^NDX or $NDX is the ticker symbol for the NASDAQ 100 depending on which quote platform you are using. There may be other variants as well but these are very common.
The symbol for First Trust NASDAQ-100 Equal Weighted Index Fund in NASDAQ is: QQEW.
The symbol for First Trust NASDAQ-100-Technology Sector Index Fund in NASDAQ is: QTEC.
The symbol for BLDRS Europe 100 ADR Index Fund in NASDAQ is: ADRU.
The symbol for BLDRS Developed Markets 100 ADR Index Fund in NASDAQ is: ADRD.
UKX Index (GBP denomitated)
The ticker symbol QQQQ was used for an exchange-traded fund (ETF) called the PowerShares QQQ Trust. In 2011, the Nasdaq Stock Market changed the ticker symbol for the ETF to QQQ to align with the common name for the fund, which represents the Nasdaq-100 Index. So, QQQQ was simply changed to QQQ.
The symbol for First Trust Capital Strength ETF in NASDAQ is: FTCS.
Dentyne is owned by Mondelez International, Inc. Their NASDAQ 100 symbol for class A common stock is MDLZ. Their mutual fund symbol is KFT.
NASDAQ 100 Trust (ticker).
The symbol for Recon Capital NASDAQ-100 Covered Call ETF in NASDAQ is: QYLD.
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