The small white "S" in the large blue "P" and the small white "A" in the large green "F" of the Physics Forums logo represent significant elements of the forum's identity. The discussion highlights a sticky thread that addresses this topic, suggesting it may be more appropriately placed in the current forum for better visibility. Participants express a sense of nostalgia and connection to past contributors, particularly one named SA, who has not posted since 2006. The community values the legacy of its members and their contributions. Overall, the logo elements symbolize a deeper connection to the forum's history and community.