A	Identificator for value Appropriate
CHR	Chein, Hrones and Reswick
COA	Center of Area
e(t)	Control error
ES	Expert System
ES1	Monitoring Expert System
ES2	Controlling System Design
F	Identificator for value Faster
G	Transfer Function
GA	Genetic Algorithms
H	Identificator for value High
IS	Identification System
J	Fitness Function
K	Gain of Proporcional Component
L	Identificator for value Low and Large
M	Identificator for value Medium
MO	Maximal Overshoot
O	Identificator for value Optimal
PID	Proportional–Integral–Derivative
RO	Relative Overshoot
RST	Relative Settling Time
s	Laplace Operator
S	Identificator for value Slower and Small
sec	Time unit second—for clear usage it is not used s, which is used for Laplace Operator
ST	Settling Time
T	Sampling Period
$T_d$	Time Constant of Derivator
TDKNOW	Time Constant of Derivator obtained by Expert System
$T_i$	Time Constant of Integrator
TIKNOW	Time Constant of Integrator obtained by Expert System
u(t)	Control variable
U	Laplace Image of Control Variable (System Input)
w(t)	Setpoint—required variable
XL	Identificator for value XLarge
XS	Identificator for value XSmall
y(t)	Controlled variable
Y	Laplace Image of Process Variable (System Output)
ZN	Ziegler–Nichols