North Philadelphia community activists are set to meet with SEPTA officials Wednesday to to voice their opposition to abbreviating the name of the late civil rights leader Cecil B. Moore on the buses that run along the avenue named in his honor. The route sign on the Route 3 buses that run along Cecil B. Moore Avenue was changed from “Cecil B. Moore Ave.” to “CB Moore Ave.” in December, officials said. Jerri Williams, a spokesman for SEPTA, said the change was made so the sign would be more visible to riders. The Route 3 bus runs from 33d Street to the Frankford Transportation Center at Bridge Street and Frankford Avenue.