LOS, or Los, or LoS may refer to: Science and technology. Length of stay, the duration of a single episode of hospitalisation. Level of service, a measure used by traffic engineers. Level of significance, a measure of statistical significance. Line-of-sight (disambiguation) LineageOS, a free and open-source operating system for smartphones and tablet computers. Loss of signal. Fading. End of pass (spaceflight) Loss of significance, undesirable effect in calculations using floating-point arithmetic. Medicine and biology.
https://en.wikipedia.org/wiki/Los