MudBlood.

I've done this fake 'tattoo' for this event: [link]

"We take this day to remember that all of us are equal, regardless of race, gender, sexual orientation, gender identity, age, religion, or magical ability.

We write “mudblood” on our arms this day not only to remember the pain inflicted on Hermione Granger by Bellatrix Lestrange for being born to Muggles, but to acknowledge the hardships people have faced for being perceived as different.
We invite Muggles and Wizards alike to join us in writing “mudblood” on our arms as a symbol to show that while we are all different, we are all equal."

Yes, I know that I was supposed to write it in my arms, but I forgot and wrote in my knuckles, but I liked this picture anyway, and I think the message was passed the same way