- Category of red/orange stars including Arcturus and Aldebaran, which have a surface temperature in the 3500–5000K region and spectra with large numbers of metal lines. K stars are the coolest apart from the M class.
- symbol for cathode, or negative electrode (1).
- In computing, the number 1024, or 210.
- symbol for constant
- symbol for Boltzmann constant (written as k)
- chemical symbol for potassium
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