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The trademark symbol (™) is a symbol to indicate that the preceding mark is a trademark. It is usually used for unregistered trademarks, as opposed to the registered trademark symbol (®) which is reserved for trademarks registered with the appropriate government agency.
In Unicode it is U+2122 ™ TRADE MARK SIGN. In HTML the code
™ can be added. LaTeX uses \texttrademark. On Windows it may be entered by holding the Alt while typing the numbers 0 1 5 3 on the numeric keypad (it is at 0x99 or 153 in CP1252) or by pressing Alt Gr+T. On macOS, it may be entered by pressing ⌥ Opt+2 . On Linux and some other POSIX-compatible systems the trademark symbol may be entered by keys sequence Compose T M.
An equivalent marque de commerce symbol (U+1F16A 🅪 RAISED MC SIGN) is used in Quebec.
Use of the trademark symbol indicates an assertion that a word, image, or other sign is a trademark; it does not indicate registration. Registered trademarks are indicated using the registered trademark symbol (®), and in some jurisdictions it is unlawful or illegal to use the registered trademark symbol with a mark that has not been registered.
There is a specific symbol, the service mark symbol (℠), to indicate the assertion of a service mark (a trademark for the provision of services). The service mark symbol is less commonly used than the trademark symbol, especially outside the United States.