What does ULN stand for?

What does ULN mean?

ULN	Ulan Bator, Mongolia Regional » Airport Codes
ULN	Ultra-Low Noise Academic & Science » Electronics
ULN	Upper Limit of Normal Governmental » FDA
ULN	upper limits of normal Medical » Laboratory
ULN	Upper Limit of Normal Academic & Science » Mathematics
ULN	Upper Limits - Normal Academic & Science » Mathematics
ULN	upper limits of normal Academic & Science » Mathematics
ULN	Unit Line Number Governmental » Military
ULN	Ultra Low Noise Governmental » Military
ULN	Upper Limits of Normal Medical » Oncology
ULN	Upper Limits of Normal Medical » Physiology
ULN	Ulnar Medical » Physiology
ULN	Ultra Low Noise Governmental » Transportation