- For the Copyright symbol (©) Hold the Alt key down and type 0169.
- For the Trademark symbol (TM) Hold the Alt key down and type 0153.
- For the Registered symbol (®) Hold the Alt key down and type 0174.
This post came about because I was searching for ways to create a copyright symbol for a batch of graphics in Photoshop.
Source: How to Create Copyright and Trademark Symbols via Keystrokes