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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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11y ago
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It means 1,000.

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Q: What does k mean in math?
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