Talk:Operation Sling-Stone/@comment-13781404-20130730143302/@comment-24.124.78.50-20130730160847

It's a cosmetic item for each warframe's left shoulder that can be toggled.

Luckily, it's on the left shoulder unlike the clan emblem which is on the right. This allows you to wear both.

As for what it does, it simply just displays to others that you participated in the event.