UVAC	Ultrasonic vibration-assisted cutting
SD	Slope degree
$S_a$	Arithmetic surface roughness
$\overline{S_a}$	Average arithmetic surface roughness
CBN	Cubic boron nitride
SPDT	Single point diamond turning
CUAC or 1D UVC	Conventional ultrasonic vibration cutting
UEVC	Ultrasonic elliptical vibration cutting
PCD	Poly-crystalline diamond
f	Vibration frequency
A	Vibration amplitude
$v_c$	Nominal cutting speed
DC	Duty cycle
TR	Tool radius
CS	Cutting speed, namely nominal cutting speed
IC	Input current
FR	Feed rate
$S/N$	Signal-to-noise ratio
CSS	Constant surface speed