text: what does it mean when people have those 3 stripes black/blue/black stickers on their cars? you know, they are stickers like the lgbt rainbow flag stickers but these are only 3 horizontal stripes and they are black then a blue strip then a black stripe. the closest thing that i can think of is leather pride. it is either that or: the black-medium blue-black flag is actually a police mourning band. it is typically worn as a band across the badge when an officer is killed in the line of duty. i have seen it in use more frequently now as a bumper sticker, i believe this is probably a show of respect for the police officers killed on september 11th.