or Bipolar Electrolytic Capacitor 4.7uF, 16V
Non-Polar and bipolar are both used to describe electrolytic
capacitors which may have a voltage of either polarity
applied. In this particular case, the only indication that
the capacitor is a bipolar type is the absence of a polarity
marking. Often there will be some other indication such as
an "N.P." mark.
The schematic symbol is usually that of an ordinary capacitor.