Abbreviation Explanation (R replaces L in all cases for the right side)
OFFENSE
LWR Left Wide Receiver
SLWR Slot Left Wide Receiver
TE-L Tight End on the left end of the line
TE-iL When two Tight Ends are on the left end of the line, the closest to the LT
TE-oL When two Tight Ends are on the left end of the line, the furthest from the LT
TE-SL A Tight End in the left slot
TE-WL A Tight End split wide on the left
LT Left Tackle
LG Left Guard
C Center
QB Quarterback
HB Halfback
HB-SL A Halfback in the left slot
HB-WL A Halfback split wide on the left
FB Fullback
FB-SL A Fullback in the left slot
FB-WL A Fullback split wide on the left
k A small k after a TE, HB, FB or WR means that they stayed in to block on a passing play
DEFENSE
DLE A Left Defensive End in a four man line
LE A Left Defensive End in a three man line
DLT A Left Defensive Tackle in a four man line
DLiT In a six man DL, the Defensive Tackle furthest from the DLE
DLoT In a six man DL, the Defensive Tackle closest to the DLE
NT Nose Tackle
LOLB A Left Outside Linebacker when 4 LBs are on the field
LILB A Left Inside Linebacker when 4 LBs are on the field
LLB A Left Outside Linebacker when three LBs are on the field
MLB A Middle Linebacker when three LBs are on the field
LCB Left Cornerback
SCBL A Cornerback playing over the left slot (SRWR)
SS A Safety playing within 8 yards of the line of scrimmage
FS A Safety playing 8 yards beyond the line of scrimmage
v It is assumed a DL always rushes on a passing play. A small v afterwards denotes they dropped in coverage
z It is assumed a LB or DB always drops in coverage on a passing play. A small z afterwards denotes they blitzed
  NOTE: The explanation for v and z above refer to their "originally designated positions" as denoted in the "Pos" 
column. Therefore if a LOLB becomes a DLE in a four man line and blitzes they will still be given a z. Similarly if 
a DLE becomes a LOLB and blitzes they will not)
HB A position with a red background and white font means the player was injured on this play
  The detail was not captured for some reason and as a result this is an estimated play