Y2K (year 2000)
The Y2K problem was the result of an industry practice that for more than 35 years had represented years in dates as only two digits, assuming in application logic that the first two digits of the year are "19." A variety of errors were introduced once such applications had to deal with dates beyond 31 December 1999.

Yahoo
A company based in Sunnyvale, California, that offers Web search, online-information, e-mail, instant-messaging and other Internet-related services. The Yahoo search engine and consumer portal, at www.yahoo.com, emerged in the 1990s as a popular navigational guide to the Web.

yard management system
A logistics management system that provides the ability to monitor and track the movement and activities of vehicles entering and departing trailer yards. This capability allows enterprises to know the contents and location of all trailers within their facilities. A yard management system also controls and directs the movement of trailers within a yard and between yard locations and dock doors.

year 2000 compliance
Confirmation that applications are free from the year 2000 problem, i.e., that they do not abnormally end or produce erroneous results as the result of incorrectly interpreting the year 2000 as "00" due to the use of only two digits to represent the year. Such compliance was a major system concern in the late 1990s, as the year 2000 approached.