Question: what is the highest level in martial arts

title: Red belt (martial arts)
text: A Red Belt is one of several colored belts used in some martial arts where each practitioner 's level is marked by the color of the belt , these are most commonly those of Kodokan style Judo origin . Like the more commonly known Black Belt , its use varies between arts , with most using it for the style founder , Grandmaster or other high rank , while others use it as the immediately pre-black belt rank or even to denote a beginner who holds no rank . In some schools , a red belt signifies ninth or tenth degree Dan rank , where the tenth degree is the highest rank attainable . In karate , even though grandmasters and non-black belts ( according to whatever system ) may both wear a `` red belt '' , the difference is obvious . Not only is there a clear difference in age , but the respective belts are different , as well : Dan rank belts are broader , with kyu ( pre-black belt ) rank belts normally having a width of 4 centimeters and dan rank belts having a width of 5 centimeters . Also , the grandmaster 's red belt is usually darker in color and embroidered with the person 's name and style ( as customary for dan rank belts ) .