mobile charge
heraldic charge not tied to the size and shape of the shield, may be placed in any part of the field; symbolic representation of a person, animal, plant, object, building, simple geometric shapes or other device, usually stylized
en-US/ˈmoʊbəl ˈt͡ʃɑɹd͡ʒ/
en-GB/ˈməʊbaɪl t͡ʃɑːd͡ʒ/