More insight to the possible meaning posted on telegram: "So, Gosar is a dentist. I am a dental hygienist.. I believe this is dental charting.. If so..Green means completed work. X means removed, the line down with the arrow indicates a tooth has dropped down .. and the Y could be an almost completed X, for partially removed... So, 2 Xs and a down arrow could be 2 down and the unfinished X is 1 almost finished or 1 to go? Summary: 2 down, 1 to go.. (**Check his Twitter, there are 2 more images marked like this there.. One has Bidan with a diagonal line through him, that means to be extracted or removed)"
More insight to the possible meaning posted on telegram: "So, Gosar is a dentist. I am a dental hygienist.. I believe this is dental charting.. If so..Green means completed work. X means removed, the line down with the arrow indicates a tooth has dropped down .. and the Y could be an almost completed X, for partially removed... So, 2 Xs and a down arrow could be 2 down and the unfinished X is 1 almost finished or 1 to go? Summary: 2 down, 1 to go.. (**Check his Twitter, there are 2 more images marked like this there.. One has Bidan with a diagonal line through him, that means to be extracted or removed)"
Yes! You're definitely on the right track! For anyone with doubts, check out slides 51 and 53 here https://www.slideshare.net/Oxfordlibrary/hard-tissue-charting Though, these slides say green means suspected work.