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Three emblems in current use and one recognised but dormant, grouped because they are one thing in law rather than four: the Geneva Conventions give them identical protective status, and which a society displays is its own choice. The group exists partly to correct the commonest assumption about them, which is that a red cross is a generic medical symbol. It is not; it is a protected emblem, and that is why shop-bought first-aid kits carry a green one.
A red cross on a white ground, protected under the Geneva Conventions.
A red crescent on a white ground, protected under the Geneva Conventions.
A red square standing on one corner, on a white ground.
A red lion before a rising sun, a recognised but dormant Geneva emblem.