indicium

noun, plural in·di·ci·a [in-dish-ee-uh] /ɪnˈdɪʃ i ə/, in·di·ci·ums.

1. indicia(def 2).

plural noun, singular in·di·ci·um.

1. a postal marking used rather than a stamp or a regular cancellation on each item in a large shipment of prepaid mail.
2. Often indicium.
   1. a printed message or instruction, especially one stamped on a package: an indicium of “bulk mail.”
   2. an indication or token.

pl n singular -cium (-ʃɪəm)

1. distinguishing markings or signs; indications