Why is transconductance called gm?

[Elektroniko]

A simple question, why is transconductance called g_m? What does the g and the _m stand for?

 

[esp1]

The symbol 'g' is used for Conductance.

The gm value is Idt/Vdt, also called the mutual conductance, so its notation is gm.

 

[LvW]

The symbol 'g' is used for Conductance.

The gm value is Idt/Vdt, also called the mutual conductance, so its notation is gm.

I suppose, Eric means: gm=dI/dV.

Because we have the dimension current/voltage=1/Ohm, this ratio gives a conductance g.
However, it is not a "classical" conductance that relates the current through a device and the voltage across THIS device.
Instead, it is a current through a certain node (collector, drain) related to a voltage at ANOTHER node (base, gate).
Therefore, it is a "mutual" conductance gm.