mark made by a seal or a stamp
Seal (emblem) The seal-making device is also referred to as the seal matrix or die; the imprint it creates as the seal impression (or, more rarely, the sealing).[1] If the impression is made purely as a relief resulting from the greater pressure on the paper where the high parts of the matrix touch, the seal is known as a dry seal; in other cases ink or another liquid or liquefied medium is used, in another color than the paper.
Service stripe A service stripe, commonly called a hash mark, is an embroidered diagonal stripe of the United States military which is authorized for wear by enlisted members on the left sleeve of a uniform to denote length of service. Service stripes vary in color.