WWE filed a new trademark for Elimination Chamber on March 31st for merchandise use, under multiple classifications with The United States Patent and Trademark Office.
Here is the description:
International Class 028: Toys, namely, action figures, accessories therefor; dolls; cases for action figures; toy wrestling rings; toy vehicles; board games; hand-held units for playing electronic game other than those adapted for use with an electronic display screen or monitor; tabletop action skill games; playing cards; puzzles; stuffed toys; plush toys; toy belts; knee and elbow pads for athletic use; toy foam hands; costume masks; costume masks; novelty face masks; Christmas tree decorations
Primary U.S Classes: 022: Games, Toys and Sporting Good 023: Cutlery, Machinery, Tools and Parts Thereof 038: Prints and Publications 050: Merchandise Not Otherwise Classified
WWE currently holds various trademarks for the name to use in entertainment services.
The company came up with this match type in 2002 and held the first one at the 2002 Survivor Series pay-per-view event where Shawn Michaels defeated Triple H, Chris Jericho, Kane, Booker T, and Rob Van Dam to win the World Heavyweight Championship.
In 2010, WWE replaced the No Way Out event with the Elimination Chamber-themed PPV event. Most years, there are two Chamber matches.
H/T to Heel By Nature