Just seen this in a new Saints and Angels shop window on six large printed stickers. I think they mean off. I was tempted to go in and explain but thought the music would be too loud for the shop assistant to hear me.
On the same trip I looked in an Adecco recruitment agency window and saw an advertisment for a School Administrator with two spelling errors in the text.
I don't claim to be perfect by any means but this just makes me .
[Not posted here before so crosses fingers that there are no errors in this post!]