Happy birthday Yin.
Just wanted to make this for you and give you a bit of hope. I drew a yin-yang sign symbolizing, well you know. lol Plus since your name has Yin, which is the dark part of the symbol, it doesn't mean that it's always evil. For you, it shows that you're tough and like everyone know, there's a light side in the darkness to help the dark through difficult times.
In this case, I didn't want to color it dark, instead I colored it in yellow to show how you always brighten up my day when I feel down. The light blue to show the coolness and peace that you bring.
Plus you're cool. ^.^ lol The stars, well, I just think they look great looking.
Hmm also cuz you're a star. ^.^ As for the Acronym, clearly the Yin is you and your name, but like I said, you being tough and having light within you to help you with your path through life.
Indomitable because you're strong, you help cheer me up, never giving up even when you do feel like you want to.
You just get back up and continue being the you that we all love.
Lastly but certainly not least, nice....I wanted something to have a bigger impact than just nice, but sometimes simple is better.
You are nice and that's a wonderful quality.
Don't give up Yin.
You got this. ^.^