I don't love emojis for this purely because they're graphically inconsistent; I can't style them with my terminal font or colour scheme. But I'm a huge fan of using various (single-width) unicode chars with colour to make terminal output a lot easier to parse, visually. Colour and iconography are extremely useful.

Hieroglyphics are vastly underused.

    𓂫 ~ 𓃝 JdeBP𓆈localhost 𓅔 %                                𓅭 pts/0

Love it, first time I see that online on forums (genuinely). Gives ideas for Reddit posts

U+130B9 is probably a good one to start with over there.

(Nsfw)

what isn't in the unicode standard these days???

It's the same thing as naming your servers Titan and Cerberus, using garish RGB LEDs on every computer part (in a glass case of course), and having a keyboard that looks like a disco.