Question:  Vítor Vianna is a Brazilian mixed martial artist, who has competed in mixed martial arts events in Brazil, Holland, and in the United States, this ranking is due to certain fights, of which type, that he has participated in which term used in combat sports such as boxing and mixed martial arts to describe a weight limit for odd class fights?

full_context: Document 1: Pound for pound: Pound for pound is a ranking used in combat sports, such as boxing or mixed martial arts, of who the better fighters are relative to their weight (i.e., adjusted to compensate for weight class). As these fighters do not compete directly, judging the best fighter pound for pound is subjective, and ratings vary. They may be based on a range of criteria including "quality of opposition", factors such as how exciting the fighter is or how famous they are, or be an attempt to determine who would win if all those ranked were the same size. In boxing, the term was historically associated with fighters such as Benny Leonard and Sugar Ray Robinson who were widely considered to be the most skilled fighters of their day, to distinguish them from the generally more popular (and better compensated) heavyweight champions. Since 1990, "The Ring" magazine has maintained a pound for pound rank of fighters. ESPN.com has a list for mixed martial artists. In December 2013, Ronda Rousey became the first woman to appear on the top 10 of a mixed-gender major publication.
Document 2: Murilo Rua: Murilo "Ninja" Milani Rua (] ; born May 22, 1980) is a retired Brazilian mixed martial artist who fought in Pride Fighting Championships. He is the older brother of former UFC Light Heavyweight Champion Mauricio "Shogun" Rua. He is known for his aggressive Muay Thai style. Rua is a veteran of Pride Fighting Championships, where he once enjoyed a reputation as one of the best middleweights in the world. Rua regularly fought at 185 pounds, but has also fought at 205 pounds and heavyweight. He is the former (and first ever) EliteXC Middleweight Champion. He also had a successful career in mixed martial arts in England appearing on both Cage Rage and BAMMA cards. He is of Portuguese and Italian descent, but was born in Brazil.
Document 3: Vinny Magalhães: Vinicius de Magalhães (] ; born July 2, 1984), is a Brazilian mixed martial artist who competes in the World Series of Fighting's Light Heavyweight division. He was a finalist in "" and has fought five times within two stints with the Ultimate Fighting Championship. He is the former Titan FC Light Heavyweight Champion, M-1 Global Light Heavyweight Champion and is also a multiple time jiu-jitsu gi and no-gi world champion. Magalhães currently fights in the light heavyweight division of the Absolute Championship Berkut.
Document 4: Vitor Belfort: Vitor Vieira Belfort (] ; born April 1, 1977) is a Brazilian mixed martial artist currently competing in the Middleweight division of the Ultimate Fighting Championship. He is the former UFC Light Heavyweight Champion, UFC 12 Heavyweight Tournament Champion, and the Cage Rage World Light Heavyweight Champion. As of June 16, 2017, he is the #11 contender in official UFC Middleweight rankings.
Document 5: Strawweight (MMA): The strawweight division in mixed martial arts generally refers to competitors weighing between 106 and 115 lb (48 to 52 kg). It sits between the lighter atomweight division and the heavier flyweight division.
Document 6: Michael Chandler: Michael Chandler Jr. (born April 24, 1986) is an American mixed martial artist fighting in the lightweight division. He is currently under contract with Bellator MMA where he is a former two-time Bellator Lightweight Champion. He was also the winner of the . Chandler is currently ranked as the #7 Lightweight in the world accrording to FightMatrix.com and is regarded as one of the top 20 greatest Lightweight fighters of all time. He was the 2011 Breakthrough Fighter of the Year. He holds notable victories over UFC Lightweight Champions Benson Henderson and Eddie Alvarez.
Document 7: Atomweight (MMA): The atomweight division in mixed martial arts generally refers to competitors weighing at or less than 105 lb . It sits below the heavier strawweight division and is the lightest weight class widely recognized within MMA. The atomweight division in mixed martial arts is not defined by the Unified Rules and is used almost exclusively for Women's MMA.
Document 8: Super featherweight: Super featherweight, also known as junior lightweight, is a weight division in professional boxing, contested between 126 lb and up to 130 lb .
Document 9: Vitor Vianna: Vítor Vianna is a Brazilian mixed martial artist, who has competed in mixed martial arts events in Brazil, Holland, and in the United States. He is the #3 ranked Middleweight prospect in the world. He is also ranked as the #69 Light Heavyweight fighter in the world by FightMatrix.com. This ranking is due to certain Catchweight fights he has participated in. He is also a highly decorated Brazilian Jiu-Jitsu competitor and is a; 2 time World Champion, 6 time Brazilian National Champion, 15 time State Champion, and ADCC NO GI Brazilian trials runner-up. Vianna is signed to the Bellator Fighting Championships.
Document 10: Bibiano Fernandes: Bibiano Fernandes da Silva Neto (born March 30, 1980) is a Brazilian professional mixed martial artist who has competed for K-1, DREAM, ONE Championship and King of the Cage. He was the first DREAM Featherweight Champion and DREAM Bantamweight Champion, and currently the ONE Bantamweight Champion. He is currently ranked as the #5 Bantamweight in the world by MMA Weekly and Fight Matrix as well as the #1 bantamweight outside of the UFC He is the main sparring partner of UFC Flyweight champion Demetrious Johnson.
Document 11: B.J. Penn: Jay Dee "B.J." Penn (born December 13, 1978) is an American professional mixed martial artist and Brazilian Jiu-Jitsu practitioner. Penn debuted and competed in the Ultimate Fighting Championship (UFC), and later in K-1. Prior to fighting for the UFC, he became the first American Gold medalist of the World Jiu-Jitsu Championship. In mixed martial arts, Penn has competed in the Featherweight, Lightweight, Welterweight, and Middleweight divisions. As a former UFC Lightweight Champion and UFC Welterweight Champion, he is one of only three fighters in UFC history to win titles in multiple weight classes. Penn was also a Co-champion in the UFC 41 Lightweight Tournament, due to an eventual draw opposite Caol Uno in the tournament finale. Through his tenures as champion, Penn unofficially unified the UFC Lightweight Championship (against Sean Sherk) and broke the all-time lightweight title defense record. Penn was inducted into the UFC Hall of Fame, as the inaugural inductee in the Modern-Era Wing by career-long rival Matt Hughes, during "International Fight Week" in July 2015.
Document 12: Douglas Lima: Douglas Lima (born January 5, 1988) is a Brazilian mixed martial artist who competes in the welterweight division of Bellator, where he is the current Bellator Welterweight Champion, in his second reign. He is also the former MFC Welterweight Champion. Lima is currently ranked as the #6 Welterweight in the world by Fight!Magazine.
Document 13: Catchweight: A catchweight is a term used in combat sports such as boxing and mixed martial arts to describe a weight limit for a fight that does not fall in line with the traditional limits for weight classes. In boxing, a catchweight is negotiated prior to the weigh-ins, which are conducted a day before the fight.
Document 14: Weight class (boxing): A weight class is a measurement weight range for boxers. The lower limit of a weight class is equal to the upper weight limit of the class below it. The top class, with no upper limit, is called heavyweight in professional boxing and super heavyweight in amateur boxing. A boxing match is usually scheduled for a fixed weight class, and each boxer's weight must not exceed the upper limit. Although professional boxers may fight above their weight class, an amateur boxer's weight must not fall below the lower limit. A nonstandard weight limit is called a catch weight.
Document 15: Super heavyweight (MMA): The super heavyweight division in mixed martial arts has no weight limit but generally refers to competitors weighing above 265 lb (120 kg). This is the definition used by the Nevada State Athletic Commission and the Association of Boxing Commissions.
ground_truth: Catchweight