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:
“The truth is, no matter how trying they become, babies two and under don’t have the ability to make moral choices, so they can’t be “bad.” That category only exists in the adult mind.”
—Anne Cassidy (20th century)