D: A podium with "S"-shape double-stranded DNA as a support, suggesting a forum with emphasis on biological sciences. The "S"-shape double-stranded DNA together with letters "P" and "F", gives the acronym for the "Philadelphia
Science Forum".
E: "P" is composed of a spectrum and a contour map. "S" is like a C. elegans. The "P" and "S" together also resemble the sword and the snake, which is the symbol of medicine. "F" is like some organelles. So, the combination stands for science and technology.
F: To emphasize the fouding place and time: Philadelphia represented by the Liberty Bell, and the forum was founded in 2007.
