an arbitrary sign (written or printed) that has acquired a conventional significance

make or leave a mark on

be a distinctive feature, attribute, or trait; sometimes in a very positive sense

identification mark on the ear of a domestic animal

identification mark on skin, made by burning

a formally registered symbol identifying the manufacturer or distributor of a product

a mark on an article of trade to indicate its origin and authenticity

a cancellation mark stamped on mail by postal officials; indicates the post office and date of mailing