They are the Dan ranks as opposed to Kyu ranks.
Shodan - 1st Degree
Nidan - 2nd Degree
Sandan - 3 Degree
Yondan - 4 Degree
Godan - 5 Degree
Nanadan - 6 Degree
Shichidan - 7 Degree
Hachidan - 8 Degree
Kudan - 9 Degree
Judan - 10th Degree
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