account number(redirected from National identification number)
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A unique number of several (often eight or nine) digits used to identify the account at a bank or brokerage. Account numbers are meant to be complicated to eliminate the possibility that two persons will have the same number or that an identity thief will correctly guess a number.
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A unique code assigned to each investor's account at a brokerage firm.
Wall Street Words: An A to Z Guide to Investment Terms for Today's Investor by David L. Scott. Copyright © 2003 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. All rights reserved.