A Fifth letter of a Nasdaq stock symbol specifying Class A shares. AAII See: American Association of Individual Investors ABO See: Accumulated Benefit Obligation ABS See: Automated Bond System ACAT See: Automated Customer Account Transfer ACES See: Advance Computerized Execution System ACH See: Automated Clearing House ACRS See: Accelerated cost recovery system ACU See: Asian currency units AD The two-character ISO 3166 country code for ANDORRA. ADB See: Adjusted Debit Balance ADB See: Asian Development Bank ADR See: American Depositary Receipt ADS See: American Depositary Share AE The two-character ISO 3166 country code for UNITED ARAB EMIRATES. AED The ISO 4217 currency code for United Arab Emirates Dirham. AEX See: Amsterdam Exchange AFA The ISO 4217 currency code for Afghan Afghani. AF The two-character ISO 3166 country code for AFGHANISTAN. AFM See: Amman Financial Market AG The two-character ISO 3166 country code for ANTIGUA AND BARBUDAAG. AI The two-character ISO 3166 country code for ANGUILLAAI. AIBD Association of International Bond Dealers AL The two-character ISO 3166 country code for ALBANIA. ALL The ISO 4217 currency code for Albanian Lek. ALT Alternative Trading System. This term is defined under section 301 of the U.S. Securities Act. AM The two-character ISO 3166 country code for ARMENIA. AMD The ISO 4217 currency code for Armenian Dram. AMEX See: American Stock Exchange AMPS See: Auction Market Preferred Stock AN The two-character ISO 3166 country code for NETHERLANDS ANTILLES. ANG The ISO 4217 currency code for Netherlands Antilles Guilder. AO The two-character ISO 3166 country code for ANGOLA. AON See: All or none order AOR The ISO 4217 currency code for Angolan Reajustado Kwanza. AOS See: Automated Order System APR See: Annual Percentage Rate APT See: Arbitrage Pricing Theory APT See: Automated Pit Trading APV See: Adjusted Present Value APY See: Annual Percentage Yield AR See: Auto-Regressive ARCH See: Auto-Regressive Conditional Heteroskedasticity AQ The two-character ISO 3166 country code for ANTARCTICA. AR The two-character ISO 3166 country code for ARGENTINA. ARS The ISO 4217 currency code for Argentinian Peso. ARM See: Adjustable-rate mortgage ARPS See: Adjustable-rate preferred stock ARPS See: Auction rate preferred stock ARR See: Average rate of return AS The two-character ISO 3166 country code for AMERICAN SAMOA. ASE See: Athens Stock Exchange. ASX See: Australian Stock Exchange AT The two-character ISO 3166 country code for AUSTRIA. ATP See: Arbitrage Trading Program ATS The ISO 4217 currency code for Austrian Schilling. AU The two-character ISO 3166 country code for AUSTRALIA. AUD The ISO 4217 currency code for Australian Dollar currency. AW The two-character ISO 3166 country code for ARUBA. AWG The ISO 4217 currency code for Aruban Guilder. AZ The two-character ISO 3166 country code for AZERBAIJAN. AZM The ISO 4217 currency code for Azerbaijani Manat. AAA+ Bank Refers to banks that are rated AAA by IBCA, Moodys Investor Service and Standard & Poors. Abandonment Controlling party giving up rights to property voluntarily. Abandonment option The option of terminating an investment earlier than originally planned. ABC agreement A contract between an employee and a brokerage firm outlining the rights of the firm purchasing an NYSE