CZ

CZ stands for:

Czech Republic , according to ISO 3166
Česká zbrojovka , used by the Czech arms factories Česká zbrojovka (Uherský Brod) and Česká zbrojovka (Strakonice) . The latter was also known for its motorcycle production.
Cetane number , a value for the ignitability of diesel fuel
China Southern Airlines , airline IATA code
Chrysler CZ , a 1935 car model
Citric acid cycle in biochemistry
Computer Zeitung , a trade journal published by Konradin Verlag Robert Kohlhammer
Condition Zero , a version of Counter-Strike, see Counter-Strike # Counter-Strike: Condition Zero
Long march (rocket) , one of the names of a Chinese launcher
Cellesche Zeitung
Cubic Zirconia, the zirconium (IV) oxide stabilized in the cubic crystal structure , s. a. Zirconia
Czochralski process , a process for growing single crystals of high quality from the melt
CZ.NIC , a private law organization based in Prague

CZ as a distinguishing mark on license plates:

Italy: Province of Catanzaro
Northern Ireland: Belfast
Norway: Jessheim in the province of Viken
Sweden: Diplomatic license plate for Portugal
Turkey:
- Diplomatic Corps (green letters on a white background)
- Corps Consulaire (white writing on a turquoise background)

cz stands for: