In a flowchart or process diagram, what is the symbol for a FIFO queue?
3 Answers
I don't know if this is canonical but, does this count?
Also here are examples of queues in SDL-88
A stack is typically represented on a blackboard like this:
Reason being, you want the diagram to show "there's only 1 way in, one way out", and it's LIFO
For a queue, I would use something like this:
Shows there's both an entry and an exit, and that it is FIFO
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:
