What label indicates that a product is a gas?

The label that indicates a product is a gas is the Compressed Gas Label. This label signifies that the contained substance is stored under pressure and can exist in a gaseous state under normal atmospheric conditions. It is critical for safety and handling, as it alerts responders and workers to the potential hazards associated with high-pressure gases, such as the risk of explosion or asphyxiation if released in a confined space.

In the context of the other options, while a Flammable Gas Label certainly identifies gases that can catch fire, it does not universally signify that a product is a gas. The term "Gas Product Label" is not a standard term used in the context of hazardous materials, making it vague and less informative than the specific compressed gas designation. Lastly, a Non-Hazardous Gas Label implies that the gas does not pose a known hazard, which does not inherently communicate that the product is a gas requiring special handling or precautions. The Compressed Gas Label is therefore the most definitive and widely recognized indicator of gas.