Target indicator

Target Indicators, also known as target markers or TI's for short, were flares used by the RAF's Bomber Command during World War II. TI's were normally dropped by the Pathfinders on the target, providing an easily seen visual aiming point for the following bombers to aim at. After their introduction, the use of TI's expanded to include en-route markers to gather up lost aircraft, additional drops of TI's to keep the target lit over long periods, and various changes in technique to address German defences.