There are no ranks in billiards. There are different tournaments that result in a player getting ranked from their play and win:loss ratios, so there is a ranking of players that changes regularly. The top ranked player, a temporary rank, is simply called the top ranked player.
The highest rank for a skill is 1
The highest ninja rank is kage
The highest rank is Tai Pan
The highest rank in Halo: Reach is Inheritor.
The black belt is the highest rank in martial arts.
The highest rank you can reach is 46.
Baiji - Baiji is the highest rank you can reach in sumdog, it's the 31st rank in sumdog.
The highest rank currently known in Platform Racing 2 is UnknownAx with a rank of 60, and he is tied with quesin, but UnknownAx hacked.
highest rank in the world is : SECRETARY GENERAL OF UNITED NATION
Reichsführer-SS. That was the highest rank in the SS which was reserved for him.
Guildmaster rank after you obtain secret rank from rescuing sicior. This is after you defeat primal dialga and graduate from the guild. The highest rank before the end of the game is master rank.
Sergeant Major of the Army is the highest rank NCO.