Not on my machine. Probably an advert.
If it is a square divided up into smaller black and white squares then it is what is called a QR code - a 2D version of a bar code.
Ask someone with a smart-phone to point their device at the code and it will link them to the advertiser's website.
You also see them on adverts on billboards and in newspapers and magazines.
its a qr code, you scan it using your smart phone and it takes you to where-ever, some magazines have them, say it's an article on racing and you scan scan the reader and see a clip of the race
You can put QR codes on headstones now. Scanning with your smartphone will bring up a memorial page with photos and a biography of the deceased, with tributes and personal memories.
Laser engraved, boxy, usually on a stainless steel plaque embedded in to the headstone, or stuck on at a later date.
Can be on memorial plaques to, when there is a cremation rather than burial.