I recently bought Planet of Judgment, a book in the Star Trek - The Original Series universe. It begins with Captain Kirk and the others (Bones, Spock, ...) getting stranded on a rogue planet and not being able to communicate with the Enterprise. However, they find a way by making some symbols which can be seen through a kind of telescope from the Enterprise. These are the symbols and their meaning:
Have these symbols ever occurred (or re-occurred) in a Star Trek series (I only saw TOS and TAS) or are they just the imagination of the writer?