D10K problem
n. The concern that a future 5-digit (10,000+ points) Dow Jones Industrial Average could create problems for financial software coded to accept only 4-digit numbers. (cf. Y2K: the Year 2000 problem.)

Example Citation:
"Curious speculation swirls around the prospect of a 10,000-point Dow Jones industrial average. At least some are concerned that the milestone—the first time the market indicator would be expressed in five digits—might create a problem similar to the year 2000 debacle, that computers used to four-digit Dows aren't prepared to handle. It's already being dubbed the D10K problem."
—June Arney, "Dow 10,000 already regarded as D10K problem for computers," The Sun (Baltimore)

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