Leak indicators are devices used to detect the presence of a leak in a system. The two crossword solutions for the term LEAK INDICATOR are DRIP and HISS. DRIP is an acronym for 'Detecting and Recording In-line Pressure, ' which is a device that uses pressure sensors to detect the presence of a leak. HISS stands for 'High-Intensity Sound Sensor, ' which is a device that uses sound waves to detect the presence of a leak. Both DRIP and HISS are commonly used as leak indicators in various systems.