x Number of ...

X No unit of quantity required (Harmonized System - See HS)

X Reactance / Réactance

y Yocto (prefix) 10^-24 = 0,000 000 000 000 000 000 000 001

Y Admittance / Admittance

Y Year (also Yr)

Y Yotta (prefix) 10²⁴ = 1 000 000 000 000 000 000 000 000

Yd Yard (1 yard = 0.9144 meter)

Yd² Square yard (1 sq. yard = 0.8 square meter)

Yd³ Cubic yard (1 cubic yard = 0.76 cubic meter)

Yr Year

z Zepto (prefix) 10^-21 = 0,000 000 000 000 000 000 001

Z Zero / Zéro

Z Zetta (prefix) 10²¹ = 1 000 000 000 000 000 000 000

Z Impedance / Impédance

Zn kg Zinc content in kilograms (Harmonized System - See HS)