M or ML
Longitudinal/Sag plane
Midline
R
Longitudinal/Sag plane
To the right
L
Longitudinal/Sag plane
To the left
R# or L#
Longitudinal/Sag plane
Notates the # of cm to the Right or Left of Midline
X
Transverse
Xiphoid
IC
Transverse
Iliac Crest
TCP
Transverse plane
Transcrestal plane
U
Umbilicus
S or SP
Transverse
Symphysis pubis
+
Transverse
Superior movement
-
Transverse
Inferior movement