What does (D) mean?

D, ‡, or (D) stands for development plan. A development plan is type of plan that becomes part of the zoning of a property once the plan and the zoning are approved. It establishes the level of development allowed absent further zoning action except as otherwise allowed or required under the Unified Development Ordinance. It may include specific committed or proffered elements required for development  
See other articles in Planning, Development tracker, Zoning