Artist's addition:

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.