https://www.reddit.com/r/Berserk/comments/1x6v6f/what_is_your_best_explanation_of_the_sacrifice/
What is a short and simple explanation of that brand that won't freak out strangers?
This is really tough. Best answer I can come up with is "it's from a manga/show, it means I've defied all odds and become master of my own fate."
I know, it's a bit of a stretch, but it's better than "I'm doomed to be a sacrifice to otherworldly demonic forces."