no connection
connection
battery
cell
variable DC source
AC source
photovoltaic cell
ground
chassis connection
fuse
resistor
variable resistor
photoresistor
inductor
capacitor
speaker
lamp
neon lamp
transformer
diode
LED
NPN transistor
PNP transistor
SPST switch
SPDT switch
DPST switch
DPDT switch
pushbutton switch N.O.
pushbutton switch N.C.
relay
AND gate
OR gate
inverter (NOT gate)