The numbering system starts at the center and moves out — a 0-technique
defensive tackle lines up directly over the center; the 1-technique is
between center and guard; the 2-technique is directly over the guard;
the celebrated 3-technique is between the guard and offensive tackle;
the 4-technique is over the offensive tackle; the 5-technique is between
the offensive tackle and tight end; the 6-technique is inside the tight
end or outside the offensive tackle on formations without a tight end;
the 7-, 8-, or 9-techniques move farther outside and away from a
defensive tackle’s normal responsibilities.