Can someone strike the stage left flat?
Every profession and hobby has its own language, the words that make sense to those in the know, but sound like gibberish to everyone else. Social groupings have them as well, of course, but these seem to serve a different purpose. Professional jargon is what I’m talking about here, and specifically the jargon of the theatre. Every production I’ve done as an adult has been in a professional theatre of some size or other, so I’m becoming a fairly fluent speaker, and every production has involved at least one first-time performer who had to get up to speed on theatre talk very quickly.
The Singing Librarian Talks 