Geneva cross

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A red Greek or St. George's cross on a white ground, used as a symbol by the Red Cross and as a sign of neutrality.

from The Century Dictionary.

• noun A red Greek cross on a white ground, displayed on flags and armlets for the protection, in time of war, of persons serving ambulances and hospitals, and of citizens rendering help to the sick and wounded. See Geneva convention.