55K

55K is a shorthand notation for 55,000. The K stands for kilo, a convention derived from the metric prefix for a thousand. In standard decimal form this value is 55,000; in scientific notation it is written as 5.5 × 10^4. In binary, 55,000 decimal equals 1101011011011000₂, and in hexadecimal it is 0xD6D8.

Commonly, 55K appears in informal writing to indicate quantities such as salaries, budgets, populations, or audience sizes. For example, someone might describe a salary as “55k a year” or reference a count of “55K followers.” The capitalization of K is stylistic and varies by author or publication, with 55k and 55K both commonly understood.

In formal or technical contexts, the shorthand can create ambiguity. In computing, K or k can also denote 1,024 (as in memory sizes) in addition to 1,000, depending on context, which makes “55K” potentially ambiguous if units are not specified. When precise meaning matters, it is preferable to spell out the value or specify the unit (for example, 55,000 people or 55 KB for kilobytes, with KB or KiB used to distinguish decimal from binary multiples).

Overall, 55K serves as a concise casual expression for fifty-five thousand, used across finance, demographics, online metrics, and everyday speech, with careful attention to context and units to avoid misinterpretation.