Yo

Yocto
Prefix representing a multiplication of 10-24
Yotta
Prefix representing a multiplication of 1024
Yottametre
A metric unit of distance equal to 1024 metres.
Young, James
Pioneered process of refining oil into Paraffin.
Young Stellar Object
The generic name for a star prior to its main sequence phase.
Young′s Double-Slit Experiment
A famous experiment which shows the wave nature of light.
Young′s Modulus
The modulus of elasticity is the slope of the stress-strain diagram in the linear region.