When I teach BPMN I like to hand out this poster BPMN-2 Poster as reference.
I particularly like the way the “Berliner BPM-Offensive” describes the use of the gateways:
- When splitting….
- When joining…
You can get the original, in many different languages from here.
Following the course, I received this poster for UML syntax.
By coincidence, the author has chosen to show exactly the same UML diagrams as I favour, therefore I am very happy to recommend his poster and include a link to his site here for download. Please note that it is UML 1.3 rather than 2.0, but no less useful for that.