Definitions containing the term y level

What does y level mean?

LVL	Level Academic & Science » Physics
SLA	Service Level Agreement Business » General
SLA	Service Level Agreement Computing » Networking
MLM	Multi-Level Marketing Business » General
SLA	Service Level Agreement Governmental » US Government
SLA	Service Level Agreement Computing » Telecom
SLA	Service Level Agreement Governmental » Police
LL	Low Level Miscellaneous » Unclassified
LOS	Level Of Service Governmental » Transportation
TLD	Top Level Domain Computing » General
TLD	Top Level Domain Internet » Domain Names
MSL	Mean Sea Level Academic & Science » Ocean Science
MSL	Mean Sea Level Governmental » Transportation
MSL	Mean Sea Level Academic & Science » Meteorology
CLEP	College Level Examination Program Academic & Science » Universities
CLEP	College Level Examination Program Academic & Science » Academic Degrees
CLEP	College Level Examination Program Community » Educational
HDLC	High-level Data Link Control Governmental » Military
HDLC	High-level Data Link Control Community » Media
HDLC	High-level Data Link Control Computing » Networking
HDLC	High-level Data Link Control Computing » Telecom
HDLC	High-level Data Link Control Computing » Drivers
SLM	Service Level Management Business » General
RTL	Register Transfer Level Academic & Science » Electronics
AGL	Above Ground Level Governmental » Military

Y level(Noun): A surveyor's instrument for measuring differences of level by means of a telescope resting in a Y-shaped support.