Twitter sends email notifications with the subject in small letters raised above the base line:
How can we do this in our messages?
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da_667ᴺᵉᶜᵏᵇᵉᵃʳᵈ ᵗᵒᵒ ʰᵃᶦʳʸ ᵗᵒ ʰᶦᵈᵉ Tweeted:
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.