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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Schematic Symbols
Date: Sun, 23 Jun 2024 16:53:44 -0000 (UTC)
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Okay, let's see if anyone can disabuse me of my ignorance on this 
matter...
In the HP service manuals for their equipment they use a few different 
symbols in their block diagrams I'm not familiar with. I can't post images 
right now but hopefully a description will suffice.

The first one is a circle with a Greek capital sigma inside it. What's 
that all about? Is it an integrator? A summing amplifier? What's the deal 
here?
Next up: a circle with a greek theta over 'f' implying some sort of 
division. Is that a phase to frequency comparitor?
A circle with a single cycle of sine wave inside it: oscillator?
Plane triangles with nothing inside them. Do they represent generic 
amplifiers or buffers?
A circle with just a plane theta inside it. Any ideas?
A circle divided into 4 equal slices like it's got a giant 'X' inside it.
As per the previous one, but inside a square box.
A circle with a capital 'S' inside it.
A square box with two double-headed arrows inside it in a 'X' arrangement.

That just about covers it. Any assistance would be most welcome!

Your pal,

CD