B or G appears on exposure of film

What is the B, G or dot on the film next to step 13?Dot or Letter Exposed Next to Step 13

The X-Rite Model 396 sensitometer is the first model to expose the film type onto the control strip.  There will be a "B" or "G" exposed next to steps 13 or 14. 
It is possible that this label is slightly overexposed and that will result in a black dot instead of a recognizable letter.  Do not be alarmed as the only overexposure is the letter, not the 21-step QC pattern.

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