A trademark, trade mark, or trade-mark is a distinctive sign or indicator, used by an individual, business organization, or other legal entity, to identify that the products or services with which the trademark appears originate from a unique source, and to distinguish its products or services from those of other entities.

A trademark may be designated by the following symbols:

• ™ (for an unregistered trade mark, that is, a mark used to promote or brand goods)
• ℠ (for an unregistered service mark, that is, a mark used to promote or brand services)
• ® (for a registered trademark)

A trademark is typically a name, word, phrase, logo, symbol, design, image, or a combination of these elements. There is also a range of non-conventional trademarks comprising marks which do not fall into these standard categories, such as those based on color, smell, or sound.

The owner of a registered trademark may commence legal proceedings for trademark infringement to prevent unauthorized use of that trademark. However, in some countries unregistered rights in a sign may also be enforced. These are often known as 'common law' rights. An unregistered sign is usually only protected within the geographical area within which it has been used or in geographical areas into which it may be reasonably expected to expand.

The term trademark is also used informally to refer to any distinguishing attribute by which an individual is readily identified, such as the well-known characteristics of celebrities. When a trademark is used in relation to services rather than products, it may sometimes be called a service mark, particularly in the United States.

Noun

trademark (plural trademarks)

1. A word, symbol, or phrase used to identify a particular company's product and differentiate it from other companies' products. Indicated by the symbol ™, when registered with a government authority it is sometimes indicated by the symbol ®.

• registered trademark
• service mark
• wordmark

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