Watch how to sign 'international sign' in American Sign Language.

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What Is International Sign Language, And How Does It Work?

Flags of the international code of Signals.

This new film shows how the IMO Polar Code supports safe and environmentally-friendly shipping in the Arctic and Antarctic waters. | International Maritime Organization - IMO

Ships International Collision Regulations Day Signals

Communication History: Telephone, Smoke Signals & Drum Signals

Corps Of Signals (Indian Army) : All You Need To Know

The history of sign language