Question: What do you call the square brackets used to target a barcode/QR scanner? I thought this would be called "reticle," but when I Google the term, all I see are circles with crosshairs. Is there a more precise term, especially in the context of a digital device/camera, or is reticle the word?

![scanner target](https://i.stack.imgur.com/vYbtD.jpg)

Answer: 
I think the best term *is* "reticle." Businesses that make the glass used in cameras call them reticles. See the images on this site: <http://www.reticles.com/reticles_kr900.htm>.
I've written a number of QR code-reading apps, and have always called it a "reticle" in my code, because (son of a photographer here) I was always taught that *any* lines, grid, crosshair, or indicia overlaid on a view (like a viewfinder in a camera) were *all* called reticles. Hence, it's a general term: a crosshair overlaid on a view is *also* a kind of reticle. I can see why it's not such a good user-facing term however, as it's not a simple, common English descriptive term. So for user-facing purposes, I'd go with Apple's usage and call it the "Focus Area," even if it's not literally used for focusing the lens— the point is it's directing the user where to put the focus of their attention.