You can also use Charmap.exe. It's built in with Windows...
Start -> Run or Search -> Charmap
A window will appear showing all available characters based on the selected font.
As you click on different characters, a display on the bottom status bar will show what keystrokes you can use.
U+2122: Trade Mark Sign Alt+0153
You can click the Select button, then the Copy button, switch to the application you're working in and Paste.
The U+ is the Unicode#
If the U+#### doesn't work, there's a Registry edit to enable it.
1. Open RegEdit
2. Navigate to HKEY_CURRENT_USER\Control Panel\Input Method
3a. There should be an entry "EnableHexNumpad" change it to 1
3b. If that entry is not there, Right-Click on Input Method
3c. Click New -> String Value
3d. A new entry will appear, change it to EnableHexNumpad
3e. Double-click on the new entry and enter 1 in the Value data box.
You may need to log-off/log-on for the change to take affect.
Then using the U+#### you can enter things like
™ ⅓⅔⅛ ℗ © ®
When using the U+#### sequence, if windows beeps at you, ignore it. Windows thinks your trying to perform and ALT+U keystroke command. So it may beep telling you there isn't one.
Happy Symbolizing!!!
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