Final answer:
The NFPA 704 Hazard Identification System symbol for a non-flammable, non-toxic compressed gas would display a '0' in the blue, red, and yellow sections of the diamond, indicating no significant health, fire, or reactive hazards, and may include a 'G' or specific code in the white section denoting that the material is gas under pressure.
Step-by-step explanation:
The symbol for a non-flammable, non-toxic compressed gas according to the National Fire Protection Agency (NFPA) 704 Hazard Identification System does not have a specific pictogram but instead would be represented by a specific arrangement of ratings within the NFPA diamond. The NFPA diamond contains four colors each denoting a specific type of hazard. For a non-flammable, non-toxic compressed gas, the blue (health hazard) should be rated at 0, red (flammability) also at 0, and yellow (reactivity) at 0. The white area (special hazards) of the diamond could have certain symbols, but for non-flammable, non-toxic gases, it would typically only contain the symbol 'G' for gas under pressure or a certain code if it was necessary to denote that the substance is under pressure and poses no additional health, flammability, or reactivity hazards. An example of this content loaded with caution would be a gas cylinder used in scientific laboratories or medical applications such as nitrogen or helium.