- What is: XLK (Technology Sector ETF)
- What is: XLF (Financial Sector ETF)
- What is: XLV (Health Care Sector ETF)
- What is: XLP (Consumer Staples ETF)
- What is: XLY (Consumer Discretionary ETF)
- What is: XME (Metals & Mining ETF)
- What is: XOP (Oil & Gas Exploration ETF)
- What is: XHB (Homebuilders ETF)
- What is: XLU (Utilities Sector ETF)
- What is: XTL (Telecom Sector ETF)
- What is: XRX (Xerox Corporation)
- What is: XOMA (Xoma Corporation)
- What is: XL (Extra Large Option Contract)
- What is: XD (Ex-Dividend Date)
- What is: XIRR (Extended Internal Rate of Return)
- What is: XOR (Exclusive Or)
- What is: XCVR (Transceiver)
- What is: X-Factor
- What is: XS (Extra Small Option Contract)
- What is: XBR (Brent Crude Oil)
- What is: XLI (Industrial Sector ETF)
- What is: XNG (Natural Gas Index)
- What is: XNY (New York Stock Exchange Composite Index)
- What is: XPT (Platinum)
- What is: XPD (Palladium)
- What is: XMARK (Mark-to-Market Exchange)
- What is: XDR (Special Drawing Rights)
- What is: XGD (Global Gold Index)
- What is: XS000 (Index Fund)
- What is: Xrate (Exchange Rate)