A team abbreviation is how you would abbreviate a team's name in three letters or less
MLB Team Abbreviations
Arizona Diamondbacks - ARI
Atlanta Braves - ATL
Baltimore Orioles - BAL
Boston Red Sox - BOS
Chicago Cubs - CHC
Chicago White Sox - CHW or CWS
Cincinnati Reds - CIN
Cleveland Indians - CLE
Colorado Rockies - COL
Detroit Tigers - DET
Florida Marlins - FLA
Houston Astros - HOU
Kansas City Royals - KAN
Los Angeles Angels of Anaheim - LAA
Los Angeles Dodgers - LAD
Milwaukee Brewers - MIL
Minnesota Twins - MIN
New York Mets - NYM
New York Yankees - NYY
Oakland Athletics - OAK
Philadelphia Phillies - PHI
Pittsburgh Pirates - PIT
San Diego Padres - SD
San Francisco Giants - SF
Seattle Mariners - SEA
St. Louis Cardinals - STL
Tampa Bay Rays - TB
Texas Rangers - TEX
Toronto Blue Jays - TOR
Washington Nationals - WAS