+9d often signifies the pinnacle of mastery within certain skill-based domains. It represents the highest rank attainable, notably in the ancient game of [Go](/wiki/Go) and various [Martial Arts](/wiki/Martial_Arts). This designation reflects profound understanding and exceptional strategic ability.
+## See also
+- [Rank](/wiki/Rank)
+- [Mastery](/wiki/Mastery)
+- [Skill](/wiki/Skill)
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