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- k-out-of-n model
- Koutsky
- Kou Zhun
- Kou Zhun Carrying Boots on the Back
- Kovalevskaya
- Kovalevskaya crater
- Kovalevskaya exponent
- Kovalevskaya, Sofya (Vasilyevna)
- Kovalevskaya theorem
- Kovalezhi Cheeramputhoor Sankara Paniker
- Kovar
- kovar alloys
- Kowalewski
- kowledge-based control
- Kow Swamp human remains
- Koyama Fujio
- Koyama's spruce
- Koyama Yūshi
- Koyré
- Kozai mechanism
- Kozai resonance
- Kozel’skiǐ
- Kozlov
- Kozma Petrovich Prutkov
- Kościuszko Rebellion