In American football, jammers are a specialized type of cornerback. Their task is to try to slow down gunners during punts by preventing them from getting a free release, giving punt returners more time to return punts.[1] A jammer is typically played by a back-up for another position. The term "jammer" is seldom used.

References

Positions in American football and Canadian football
Offense (Skill position) Defense Special teams
Linemen Guard, Tackle, Center Linemen Tackle, End, Edge rusher Kicking Placekicker, Punter, Kickoff specialist
Quarterback (Dual-threat, Game manager, System) Linebacker Snapping Long snapper, Holder
Running backs Halfback/Tailback (Triple-threat, Change of pace), Fullback, H-back, Wingback Backs Cornerback, Safety, Halfback, Nickelback, Dimeback Returning Punt returner, Kick returner, Jammer, Upman
Receivers Wide receiver (Eligible), Tight end, Slotback, End Tackling Gunner, Upback, Utility
Formations (List)NomenclatureStrategy