There are multiple definitions:

1. light-curing unit(English)

   • refers to dentin thickness and intrapulpal temperature rise
   • CQ, LED, MAPO, TPO, SDR
   • Photonics, Dentistry, Materials science
   • https://doi.org…ent.2011.10.018
   • https://doi.org…55/2019/4250284

2. low callous-unemotional [trait](English)

   • CP, HCU
   • Behavior(al science), Emotional aspects, Pediatrics, Psychology, Medical imaging, Brain (dys)function, Misconduct
   • https://doi.org…0802-015-0073-0