Y (yttrium [element])

Y-BOCS (Yale-Brown Obsessive-Compulsive Scale)

YAC (yeast artificial chromosome)

Yb (ytterbium [element])

YLD (years lived with disability)

yo (years old)

YOB (year of birth)

YPLL (years of potential life lost)

yr (year)

YTD (year to date)