A specimen is a real-world example of how a trademark is actually used on the goods or in the offer of services. Labels, tags, or containers for the goods are considered to be acceptable specimens of use for a trademark. For a service mark, specimens may be advertising such as magazine advertisements or brochures.

Specimens are required in applications based on actual use in commerce, Section 1(a), 15 U.S.C. §1051(a), and must be filed with the Amendment to Allege Use, 15 U.S.C. §1051(c), or the Statement of Use, 15 U.S.C. §1051(d), in applications based on a bona fide intention to use the mark in commerce, Section 1(b), 15 U.S.C. §1051(b). Specimens are not required for applications based on Section 44 of the Trademark Act (for owners of foreign trademark applications and registrations), 15 U.S.C. §1126.