X
XBRL - Extensible Business Reporting Language (XML-based electronic language for financial reporting)
XHTML - Extensible Hypertext Markup Language (newer formulation of HTML as an extension of XML)
XML - Extensible Markup Language (a generic language of the World Wide Web Consortium (W3C) for creating new markup languages)
XSL - Extensible Stylesheet Language (defines how an XML document is to be presented - Web page presentation)
Y
YLD - yield (income received by an investor from a security, expressed as a percentage of the money invested or of the current price of the security)
YMPE - year's maximum pensionable earnings (earnings on which benefits from Canadian and Quebec pension plans are based)
YTC - yield to call (a yield calculated on the assumption that a bond will be called on the first permissible date, and redeemed at the price laid down in the indenture for the first call date)
YTD - year-to-date (the period beginning January 1st of the current year up until today's date)
YTM - yield to maturity (a bond's composite rate of return off all payouts, coupon, and capital gain or loss)
Z
ZBA - zero balance account (a checking account with which checks are written, or deposits are made, with the net balance transferred to a concentration account)
ZBA - zero bracket amount (standard deduction on tax returns)
ZBB - zero-based budgeting (an approach to budgeting which requires departments to justify their budgets, with new cost estimations, for each budget period instead of relying on historical cost assumptions)