#football_back_position__back  the position of a player on a football team who is stationed behind the line of scrimmage
  supertype:  #position.role  (in team sports) the role assigned to an individual player; "what position does he play?"
  member of:  #backfield  #secondary
  subtype:  #linebacker__line_backer  the position of a defensive football player who plays close behind the line of scrimmage
  subtype:  #quarterback__signal_caller__field_general__fieldgeneral  the position of the football player in the backfield who directs the offensive play of his team; "quarterback is the most important position on the team"
  subtype:  #fullback  the position of a back on a football team
  subtype:  #halfback  the position of a back on a football team
  subtype:  #tailback  the position of the offensive back on a football team who lines up farthest from the line of scrimmage
  subtype:  #wingback  the position of the offensive back who lines up behind or outside the end

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