Not exactly sure what you mean.

Unicode emoticons can be copied and pasted and work everywhere, but will display slightly differently on different devices:

https://unicode-org.github.io/emoji/emoji/charts-15.0/emoji-list.html

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I wasn't specific before, sorry. I meant emote packs made by different Nostr users.

Thank you though!

I use Unicode emoticons in Amethyst and Algia. Put my "pack" together myself. Don't know if there's any other way to do it.

Which client are you using?

Amethyst.

I ran across a pack once and added it but I've never seen that feature again