1. A light in which the total duration of light in each period is clearly shorter than the total duration of darkness and in which the flashes of light are all of equal duration.
2. Commonly used for a single-flashing light.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Level (technician training - WWA)
Latitude (in degrees)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM