What does raw appear in the lower right corner of Nikon camera's main screen mean?

D5 100 When setting the photo quality (storage quality), you can choose to save it as RAW lossless recording format (file suffix nef) or common photo recording format JPG. When saving in JPG format, you can also select fine (f, compression ratio 1:4), standard (n, compression ratio 1:8) and basic (b, compression ratio 1: 16). The greater the compression ratio, the greater the loss of image details. RAW format stores the original lossless information from sensors without in-machine processing, which is beneficial to the post-processing of photographers and is highly praised by senior photographers. Because the files in RAW format can't be recognized by the commonly used photo browsers in Windows, they need to be post-processed and converted into JPG format to display images, so D5 100 also provides a storage mode of RAW+JPG, that is, what we call RAW+F, RAW+N, RAW+B and so on will store two image files with the same name in the memory card, and the suffix is. Nef and Jpg respectively.