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A lower-case k, the SI prefix for a factor of one thousand.
k is the SI prefix kilo, a factor of one thousand. It is lower case by definition, which is what distinguishes kilo from the capital K of the kelvin.
Denotes the SI prefix kilo, a factor of one thousand.
Contexts: Mathematics
Is lower case, unlike the prefixes for a million and above. The capital K is the unit symbol for the kelvin, so kW and KW are not the same thing.
Contexts: Mathematics
Is frequently written as a capital in computing contexts, where KB has historically also meant 1024 bytes rather than 1000 — a usage the SI does not recognise and for which the separate binary prefix kibi (Ki) exists.
Contexts: Software
The lower-case Latin letter k: a vertical stroke with an ascender, met at mid-height by two short diagonals, one rising and one falling.
A third claimant to the letter k, alongside the kelvin.
Lower-case k is the prefix kilo; capital K is the kelvin. The case is the whole distinction.