Is K for 1000 capitalized?

Is K for 1000 capitalized? The capital letter K is sometimes used informally to represent one thousand (dollars), especially in newspaper headlines. There is no space between the numeral and the letter K , as in 75 K . The letter K should not be used as an abbreviation for one thousand (dollars) in formal writing.

The capital letter K is sometimes used informally to represent one thousand (dollars), especially in newspaper headlines. There is no space between the numeral and the letter K , as in 75 K . The letter K should not be used as an abbreviation for one thousand (dollars) in formal writing.