CoP	Center of pressure
piCoP	CoP position estimate from pressure insole data
fpCoP	CoP position measured with force platform data
GRF&M	Ground reaction forces and moments
IMU	Inertial measurement unit
${\mathrm{R}}_0$	Reference coordinate system
${}^{\mathrm{pi}}\mathrm{piCoP}$	piCoP expressed in the pressure insole reference frame
${}^0\mathrm{fpCoP}$	fpCoP expressed in ${\mathrm{R}}_0$
${}^0\mathrm{piCoP}$	piCoP expressed in ${\mathrm{R}}_0$
RMSE	Root mean square error
AP	Anteroposterior
ML	Mediolateral
TM	Motion executed during the studied trial
CTM	Motion executed during the calibration trial