1S       Side One
2S       Side Two
A1       Single
AL       All
AO       Single End Overhang
AS       Siding
B1       Bolster
BC       Back of Cab
BI       Bilateral
BK       Rear
BL       Block
BR       Brick
BS       Both Sides
BT       Bottom
CH       Casing Head Flange
CT       Center
DO       Double End Overhang
DT       Downstream Tap
DU       Dual Fuel Tank Position
EX       Exterior
FR       Front
FS       Front Spare
GF       Rig Floor
IN       Inside
IT       Interior
KB       Kelly Bushing
LC       Less Critical Surface
LO       Lower
LT       Left
M1       Multiple
MC       More Critical Surface
MD       Middle
NS       Not Specified
NT       Next Relative Position
OA       Overall
OS       One Side
OT       Outside
R0       Relative Position 10
R1       Relative Position 1
R2       Relative Position 2
R3       Relative Position 3
R4       Relative Position 4
R5       Relative Position 5
R6       Relative Position 6
R7       Relative Position 7
R8       Relative Position 8
R9       Relative Position 9
RA       Relative Position 11
RB       Relative Position 12
RC       Relative Position 13
RD       Relative Position 14
RE       Relative Position 15
RF       Relative Position 16
RG       Relative Position 17
RH       Relative Position 18
RI       Relative Position 19
RJ       Relative Position 20
RK       Relative Position 21
RL       Relative Position 22
RM       Relative Position 23
RN       Relative Position 24
RO       Relative Position 25
RP       Relative Position 26
RQ       Relative Position 27
RR       Relative Position 28
RS       Relative Position 29
RT       Relative Position 30
RU       Relative Position 31
RV       Relative Position 32
RW       Relative Position 33
RX       Relative Position 34
RY       Relative Position 35
RZ       Relative Position 36
S1       Relative Position 37
S2       Relative Position 38
S3       Relative Position 39
S4       Relative Position 40
S5       Relative Position 41
S6       Relative Position 42
S7       Relative Position 43
S8       Relative Position 44
S9       Relative Position 45
SA       Relative Position 46
SB       Right
SC       Relative Position 47
SD       Relative Position 48
SE       Relative Position 49
SF       Relative Position 50
SN       Stone
SP       Spare Tire Position
SS       Rear Spare
ST       Stucco
SU       Sub-sea
TB       Tank Bottom
TP       Top
TS       Two Sides
UC       Under Cab
UN       Unilateral
UP       Upper
UT       Upstream Tap
WF       Wood