OSLs
OSLs is a term that can refer to several different concepts depending on the context. One common meaning is the Optically Stimulated Luminescence (OSL) technique, a method used for dating archaeological and geological materials. OSL dating relies on the fact that minerals like quartz and feldspar can trap electrons when exposed to natural radiation. When these materials are heated or exposed to light, these trapped electrons are released, emitting photons of light. The intensity of this emitted light is proportional to the amount of radiation the material has absorbed over time. By measuring this luminescence and knowing the background radiation levels, scientists can estimate how long ago the material was last exposed to sunlight, effectively "resetting the clock."
Another interpretation of OSL could be related to "Official School Leaving Certificates" or similar educational qualifications
A less common but possible usage of OSLs might be as an acronym for specific organizations or