Rarely i used to hear cyclone created and target to hit indian coast and now it is X kilometers from the coast and Flag X has to hoisted to indicate the fisherman and the people about the cyclone warning. May be these symbols are popular among the coastal guard and fisherman.
I was eager to know these signals and wish to share to you too , this might be the reason for the posts.
Find below the Indian Coastal Cyclone Warning Signals
To know more about tropical cyclones and its related information. Check Here
Please have look at Other Countries Maritime Warning Signals