I know this as a bye, as in Team E has a bye this round.
The term appears to have originated with cricket, in which a bye is a run scored when the batsman has not hit the ball. This phrase was later applied to tournaments in which a team advances without playing. In baseball, American soccer, and American and Canadian football it has been further extended to gaps in the regular season when a team does not play, either because there are an odd number of teams in the league or because, in the case of the NFL, there are more weeks in the season than games for any team.