The wide receivers typically wear number 81 in American Football. Some tight ends wear it as well.
Keyshawn Johnson wore #19 prior to the NFL allowing wide receivers to do so starting in 2004.
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Pass routers or maybe wide receivers.
Catch passes
These are the current wide receivers on the 2012 Steelers depth chart:Emmanuel SandersMike WallaceArnaz BattleAntonio BrownJerricho Cotchery
There are two wide receivers on the field during a football game.
Nick Caserio
Jerry rice
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There must be a minimum of four receivers, but most teams get five because of the dime formation, which has five receivers.
Terry Bradshaw had more than three wide receivers available to him throughout his career. His two main receivers, especially during the Super Bowl years, were Lynn Swann and John Stallworth.