WASHINGTON — The Municipal Securities Rulemaking Board proposed a rule change Tuesday that would limit dealers from using the term “NRO,” or “not reoffered,” in written communications about new muni securities, a move aimed at ensuring market participants will have accurate and timely price and yield information.

A dealer could use the term only if it also discloses the initial offering price or yield information on the securities, the board said in proposed changes to its Rule G-34 on new issues.

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