Why am I finding this button on the floor at work?

"La marca del diablo" with a 666 under a skull and crossbones? "The mark of the devil?" Is that what it means? Why is this on the floor in my office???

There's an online company for clothing/accessories with this exact same logo and the website is lamarcadeldiablo.com with distributors all over the world. Much of their merchandise, I take it, is popular with the motorcycle culture.

Oh - they have clothing for men, women and kids. Cool stuff - 666, the devil and children.