Semaphore flags is the system used for communicating information at a distance by using visual signals with hand-held flags. Semaphore flags are usually red and yellow for signalling between ships at sea and blue and white for signalling to and from land
When you see the “Numerical” flag it means that everything after is a number. When the letter J (Alphabetic) flag is shown in the number, it means that the number is finished and the next sequence is alphabetic.
We will be using semaphores in next Thursdays meeting so have a look at the picture below to practice.
See if you can work out the mysterious cryptic message at the bottom of this post