D.C. Mun. Regs. tit. 27, § 2502
2502.1 The minimum acceptable purchase description shall be the identification of a requirement by use of a brand name followed by the words "or equal." This purchase description shall be used only when adequate specifications or a more detailed purchase description cannot be made available.
2502.2 When using a brand name or equal purchase description, the requesting agency shall also provide a list of salient characteristics, or the minimum acceptable features.
SOURCE: Final Rulemaking published at 35 DCR 1574 (February 26, 1988).