There are multiple definitions:

1. you only live once(English)

   • QOL, YLL
   • Practical shorthand

2. you only look once(English)

   • an approach to object detection, framing object detection as a regression problem to spatially separated bounding boxes and associated class probabilities. A single neural network predicts bounding boxes and class probabilities directly from full images in one evaluation
   • CNN
   • Military medicine, Safety and health, Engineering aspects, Neural network, Practical shorthand
   • https://pjreddie.com/yolo/
   • https://doi.org….3390/s24227387