Use of the symbol 
Use of the 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 ® symbol with a mark which has not been registered.
Trademarks versus service marks 
There is a specific 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 of the United States.
Entering the symbol 
- On Windows systems, a superscript trademark symbol can be input using Alt codes, by holding Alt while typing the numbers 0 1 5 3 on the numeric keypad, finally releasing Alt.
- In the X Window System, it can be input by pressing Compose, then T and finally M.
- On GNOME systems, it can be input by pressing Ctrl + ⇧ Shift + U + 2 1 2 2.
- On Macintosh systems, it can be input with ⌥ Opt+2. On some Apple keyboards, it is entered with ⌥ Opt+R
- In LaTeX,
\texttrademarkis used in text or math mode.
- Apple's iOS keyboards support the symbol in iOS 5 and above.
The service mark symbol has a similar function and denotation.
See also 
- Australian trade mark law
- Canadian trade-mark law
- Trademark law
- United Kingdom trade mark law
- United States trademark law
- Character entity references in HTML 4
- “How to use the ® and TM Symbol”
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