What does it mean that the specifications of photography entries are 8R?

The standard size of 8R is 8x 10 inch, that is, the longest side is not more than or less than 10 inch and the short side is not more than 8 inches, that is, as long as the long side is equal to 10 inch and the short side is less than 8 inches; If the aspect ratio is less than 2: 1, some competitions have additional regulations, and the long side can be lengthened to 12 inch. For a square composition, it is specified to be 8×8 inches. For the white edge caused by composition, you can cut off the handed-in works with a knife. If the actual composition is 10x7 inches, of course, the extra 1 inch white edge can be cut off.