Is there any character for the JMS queue? I know for example. databases, files, classes should be done in the same way, but what about JMS elements?
If you are considering custom (higher-level) architecture schemes, you can use the cloud symbol (however, in my personal opinion, this is more for topics) or those that are contained in this tutorial: JMS Basic Concepts
There is a wonderful book called “Enterprise Integration Templates” that has a nice visual language and symbol for messaging systems, here is a link to the diagram they use for the queue http://www.eaipatterns.com/MessageChannel.html
http://www.eaipatterns.com/downloads.html has stencils for Visio with all the figures from the book.