Apparently the index finger and clenched hand are an SOS symbol. It might be a china-only thing.
International maritime flags featured in this post: Foxtrot - "I am disabled; communicate with me." Victor - "I require assistance." Golf - "I require a pilot."
Flags for negative image: Juliett - "I am on fire and have dangerous cargo on board: keep well clear of me." Uniform - "You are running into danger." Delta - "Keep clear of me; I am maneuvering with difficulty."
Teto... Also, yes, the exit sign and door are from TADC.
