Twitter sends email notifications with the subject in small letters raised above the base line:
How can we do this in our messages?
Small Superscript Letters in Gmail Subject Line
gmailtext formatting
Related Solutions
Add some before the navigation links
Click the down arrow next to the reply arrow (upper left corner). That'll give you the option to (additionally) Forward, Reply all (not pictured), or Edit subject.
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Best Answer
They insert Unicode superscripts in subject line. You can do, too: there are sub/superscript generators online, for example this one. Example:
In principle, one can type these directly but you'd have to know the Unicode code points and how to use them to enter characters on your device.