It is exiftool -IPTC:SpecialInstructions (it will be a string starting with FBMD.) And while it’s obviously (can be used for) for tracking, it’s just a exi

It is exiftool -IPTC:SpecialInstructions (it will be a string starting with FBMD.) And while it’s obviously (can be used for) for tracking, it’s just a exif tag, “Special instructions” is a text for humans, not machine instructions. So s/Structural abnormality IPTC special instruction/a standard exif tag/ for less click-bait.