queuediagram
What is the symbol for a queue?
In a flowchart or process diagram, what is the symbol for a FIFO queue?
Solution
I don't have a source to cite, unfortunately, but I recall seeing it represented as an isosceles trapezoid.
Actually I found an example of it here (though maybe not the most authoritative of sources).
Edit: From comments it looks like the example site I had linked is no longer available. This is a recreation of what was in the original document:
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