Why is the diode symbolised as >! ? Any specific reason ?

Answer 1

A symbol was needed to indicate that it conducts conventional current well in one direction, and could be considerd to block current in the other direction, so an arrow pointing in the direction of conventional current (opposite the direction of electron flow) set against a bar seemed like a good way of indicating its properties.

Answer 2

The reason why is none of the above. The diode symbol was instigated at the time of thermionic tubes. The tube diode has a filament which is drawn as a kind of delta with connections on either side. The anode or plate was drawn as a tee line. In the solid state diode, the 2 filament connections are not needed as it is has a "cold cathode" so it was changed to one wire going to the center of the delta. The shape of the anode was not changed.

The picture of the diode looks like it should be pushing the current one direction but that is not the origin of the symbol, but maybe the reason it has been kept.

Answer 3

Yes, the arrow against the line represents the different semiconductor material that the diode is made of and for the conventional flow which is opposite that of electron flow if the diode current has the same direction as the arrow then the diode is conducting

Answer 4

While true the arrow and bar were intended to show current would flow in one direction, the arrow and be blocked in the other, the bar. The symbol was created when it was believed that current flowed from positive to negative. Of course the naming of pos. and neg. is arbitrary but current is now accepted as the flow of electrons which are considered to have neg. charge. Hence the arrow indicating the positive side or anode.

Answer 5

indicates the direction of flow of conventional current(from p to n-type)..and ! indicates current cannot reverse...(unidirectional flow)