1e4

1e4 is a compact numeric representation used in scientific notation to denote ten thousand. It expresses 1 × 10^4, which equals 10,000. The 'e' (or 'E') indicates the exponent of ten, applied to the preceding digits. This notation is common in mathematics, science, and computing for expressing large or small numbers succinctly.

In programming and data formats, 1e4 is typically treated as a floating-point literal. Languages such as Python, Java, JavaScript, C, and many others interpret 1e4 as 10000.0. In JSON and YAML, numbers may be written in exponential form, including 1e4. In spreadsheets, the same idea often appears as 1E4, with the exact representation depending on the application and locale. While 1e4 equals 10000, it is stored as a floating-point value in most contexts, which can affect arithmetic and formatting in edge cases. Nevertheless, integers up to 2^53 are exactly representable in IEEE 754 double precision, so 10000 is exact in common floating-point implementations.

The notation is widely used to express constants that span large ranges, to configure scale factors, or to present results in a compact, human-readable form. It helps avoid long strings of zeros and clarifies the order of magnitude in scientific and computational work.