From Newsgroup: uk.rec.audio

So for example, Valves or as the Americans call them Tubes with their
multiple electrodes, Transistors, SCRs and FETs with their subtle
differences. About the only variation we saw in these in my seeing days was the enclosing line, sometimes its there, sometimes not.
You did for a while see two representations of a resistor, either a zig-zag pattern or just a rectangle with a wire each end.
Of course things like Voltage regulators, zener diodes and the many other kinds of semiconductor do vary a bit too, as does how the earth is depicted.
Ceramic filters and their ilk can be different as well, but in the main you can follow things.
It has got a lot harder with the aforementioned regulators and other kinds
of chips, but since many are custom made you usually get descriptions of the 'black box' devices. I remember my first encounter with a single chip stereo FM decoder was somewhat confusing at the time.
Brian
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