because it is :P
OTCBB stands for Over The Counter Bulletin Board. This is a system for OTC equity securities that are not listed on the NASDAQ. Brokers have to subscribe to this non-electronic system and can then use it to enter orders for OTC securities.
Over-the-counter (OTC) stocks are generally not listed on major exchanges like NASDAQ; instead, they are traded through a network of dealers. OTC stocks are typically found on platforms such as the OTC Bulletin Board (OTCBB) or the Pink Sheets. While NASDAQ does not handle OTC stocks, some companies may transition from OTC markets to NASDAQ if they meet the listing requirements.
When a company wishes to "uplist" from otcbb or pinksheets to Nasdaq it must first file S-1 and S-1a until final approval. Once final approval is obtained the SEC files a CERTNAS.
The OTCBB symbol for a company is a unique identifier used for trading its stock on the Over-the-Counter Bulletin Board.
The symbol for PowerShares NASDAQ Internet Portfolio in NASDAQ is: PNQI.
The symbol for ProShares Ultra Nasdaq Biotechnology in NASDAQ is: BIB.
The symbol for ProShares UltraShort Nasdaq Biotechnology in NASDAQ is: BIS.
The symbol for iShares NASDAQ Biotechnology Index Fund in NASDAQ is: IBB.
The symbol for NASDAQ Premium Income and Growth Fund Inc. in NASDAQ is: QQQX.
The symbol for Fidelity Nasdaq Composite Index Tracking Stock in NASDAQ is: ONEQ.
The symbol for Global X NASDAQ China Technology ETF in NASDAQ is: QQQC.
The ticker symbol for Nasdaq Stock Market is NDAQ and, not surprisingly, it trades on the Nasdaq.