Label on the body

[jerryy]

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Have you ever wondered what this label is used for? It shows up not just on Fujifilm camera bodies, but on ones made by other manufacturers as well.

This label tells you the line where the sensor is inside the body. If you have ever tried to attach your camera body to a birding scope or telescope or something other than a regular camera lens, you run into an issue of getting it to focus. Some of those instruments tell you they have a certain distance (called back-focus) behind the last "lens" element where the image is actually projected. You then need to add in extension tubes of one kind or another between the "lens" and the camera body to get the projected image onto the sensor. But you need to know where the sensor is to be able to measure the distance correctly. This label tells you the line where the sensor is in the body.

[SuperMentality]

Had no idea 

[jerryy]

It is also called the flange distance, which for the X-Mount system is 17.7mm (17,7mm). One common distance other systems use is 55mm.