Your keyboard includes a
|trademark||alt 0153||option + 2|
|registered trademark||alt 0174||option + r|
|copyright||alt 0169||option + g|
Trademark symbols are set as superscripts—smaller characters positioned above the baseline of the text (Roxy’s Pizza™, Caring Is Our Business®). If you use proper trademark symbols, they’ll appear at the right size and height. No space is needed between the text and the trademark symbol.
Copyright symbols appear in line with the text (© 1999). Use a nonbreaking space between the copyright symbol and the year to ensure the two don’t end up on different lines or pages.
2018 MegaCorp Inc.
© 2018 MegaCorp Inc.
Must you put a space after the copyright symbol? No, but semantically, it makes good sense. The © directly replaces the word
Some word processors automatically substitute a symbol when you type (TM), (R), or (c). Be cautious with this feature, because references like Section 12(c) can be silently converted to Section 12©. Your spelling checker won’t detect this error, and it’s easy to overlook while editing.
Copyright © 2018 is redundant. Word or symbol—not both.
I always use the nonitalicized versions of these marks, even if the adjacent text is italicized. I think it looks better. But that’s a preference, not a rule.