K-42
K-42 or K42 may refer to:
- K-42 (Kansas highway), a highway in Kansas
- The K-42 Reconnaissance Camera, a prototype long-range camera developed by the United States Air Force in the early 1950s
- K42, a discontinued open-source research operating system
- Potassium-42 (K-42 or 42K), an isotope of potassium
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