How do I add Trademark sign in copy and subject line of my email?

Simple non-ASCII (but Latin-1) symbols like copyright symbol © and trademark symbol ™ can be pasted directly into an email body or Subject line. Marketo will perform the necessary encoding automatically.

Note Marketo does not automatically encode all non-ASCII characters. If including Emojis or other high characters you must pre-encode all of them (including any that are usually automatically encoded).