Strictly, 2¹⁰ (1,024) bytes, as opposed to a kilobyte.
A unit of length equal to one-thousandth of an inch (25.4 µm).
A thousand, especially a thousand of some currency (dollars, pounds sterling, etc.).
To use the word thou.
To address (a person) using the pronoun thou, especially as an expression of contempt or familiarity.