system
A chat on subreddit /r/NoStupidQuestions
human
This is a dumb question, but I don't know code well and am trying to learn. 

Are they literally putting the emoji in the formula? Or is it [woman] + [Medical] = lady doctor?
gpt
It's kinda like a combo command.  If you put three characters next to each other, the one for woman, zero-width joiner, and medical, the software displaying emojis says "I see those three back-to-back, I know to replace that with an icon for a woman doctor".