About the abbreviations

Player Pages

Passing
ATT - Passing attempts
CMP - Completions
PCT - Completion percentage
YDS - Passing yards
YPA - Passing yards per attempt
TD - Passing touchdowns
INT - Passing interceptions
SKD - Times sacked
SKY - Sack yards lost
RAT - Passer rating
RAT+ - Passer rating relative to the league average. A rating of 100 was exactly league average for that season, anything higher than 100 is above league average, below 100 is below league average.

Rushing

ATT - Rushing attempts
YDS - Rushing yards
AVG - Average yards per attempt
TD - Rushing touchdowns
LNG - Long run for the season, "t" designates that the play was a touchdown

Receiving

REC - Receptions
YDS - Receiving yards
AVG - Yards per reception
TD - Receiving touchdowns
LNG - Long reception for the season, "t" designates that the play was a touchdown

Defense

SK - Sacks
SFY - Safeties
INT - Interceptions
YDS - Yards from interceptions
LNG - Longest interception return
TD - Interception touchdowns

Punt Returns

RET - Number of punt returns
YDS - Punt return yards
AVG - Average yards per punt return
FC - Number of fair catches
LNG - Longest punt return of the season
TD - Punt return touchdowns

Kickoff Returns

RET - Number of kickoff returns
YDS - Kickoff return yards
AVG - Average yards per kickoff return
LNG - Longest kickoff return of the season
TD - Kickoff return touchdowns

Punting

PT - Number of punts
YDS - Total punt yards
LNG - Longest punt
BLK - Number of punts which were blocked
TB - Number of touchbacks
I20 - Number of punts inside the opponents 20 yardline
NET - Net punting average
AVG - Gross punting average

Kicking

x-y - Number of kicks made/number of kicks attempted, between those distances
LNG - Longest field goal made
FGM - Total field goals made
FGA - Total field goals attempted
XPM - Extra points made
XPA - Extra points attempted

Fumbles

TOT - Total number of fumbles
OWR - Fumbles by own team recovered
OPR - Fumbles by opponent recovered
YDS - Yards gained on fumble recoveries
TD - Fumble recovery touchdowns

Team Pages

1st Downs

RS - First downs gained by rushing
PS - First downs gained by passing
PEN - First downs gained by penalty
TOT - Total first downs

Passing
ATT - Passing attempts
CMP - Completions
PCT - Completion percentage
YDS - Passing yards
YPA - Passing yards per attempt
TD - Passing touchdowns
INT - Passing interceptions
SKD - Times sacked
SKY - Sack yards lost
RAT - Passer rating

Rushing

ATT - Rushing attempts
YDS - Rushing yards
TD - Rushing touchdowns

Receiving

REC - Receptions
YDS - Receiving yards
TD - Receiving touchdowns

Misc

PEN - Penalties
PYD - Penalty yards
FUM - Total number of fumbles
LST - Number of fumbles lost

Punting

PT - Number of punts
YDS - Total punt yards
BLK - Number of punts which were blocked
TB - Number of touchbacks
I20 - Number of punts inside the opponents 20 yardline

Kicking

FGM - Total field goals made
FGA - Total field goals attempted
XPM - Extra points made
XPA - Extra points attempted

Punt Returns

RET - Number of punt returns
YDS - Punt return yards
TD - Punt return touchdowns

Kickoff Returns

RET - Number of kickoff returns
YDS - Kickoff return yards
TD - Kickoff return touchdowns

About statistical abbreviations