Category 4 may refer to:
- Category 4 cable, a cable that consists of four unshielded twisted-pair wires with a data rate of 16 Mbit/s and performance of up to 20 MHz
- Category 4 fireworks, British fireworks that are for sale only to professionals
- Category 4 hurricane, a hurricane in the second-most-intense category on the Saffir–Simpson Hurricane Scale
- Category 4 influenza pandemic, an American influenza pandemic with a case-fatality ratio between 1% and 2%
- Category four stadium, a football stadium of the highest quality as ranked by the UEFA
Famous quotes containing the word category:
“Despair is typical of those who do not understand the causes of evil, see no way out, and are incapable of struggle. The modern industrial proletariat does not belong to the category of such classes.”
—Vladimir Ilyich Lenin (1870–1924)