At the time I used the gift feature it was just an option within the dashboard, but checking now there is an entire page explaining it (really well done)

https://mailoji.com/gifts

And I’m a giant fan of ENS as a protocol. FYI even though there is a 3 character minimum because they use Unicode there are a few hundred emojis that are technically 3 characters allowing for registration of single character emoji ENS names. Beware though Unicode also allows Zero Width Joinder characters so there are people who add them in bad faith in attempt to sell desirable names to unsuspecting buyers that don’t get what they think they are paying for.

Edit: the link was bad, but example of legit single character emoji ENS is [pirate flag].eth you can search it directly in the ENS App