It depends on the context.
It can mean 1000 (as in kilo).
It can represent a constant, specially a constant of proportionality.
It can represent a unit vector in the third mutually perpendicular direction (the z-axis).
It is often used as an index (often after i and j).
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It could mean 20000 + 50 = 20050
Combined in math is taking K one at a time. This is without using repetition.
what does key mean in math
arithmetic
Kilometre , kilogram