The Errand of Mercy Meal Support was a service under the City of San Francisco Sanctuary Program. This service provided the rations which were doled out to Sanctuary District residents at a ration distribution center. (DS9: "Past Tense, Part I")

This service was named on a sign on the ration distribution center in Sanctuary District A. This sign appeared in the 2nd and 3rd editions of the Star Trek Encyclopedia on pg. 427. It did not make an appearance in the 4th edition.
The name of the agency appears to be a reference to the Star Trek: The Original Series episode "Errand of Mercy".
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