How multi-byte values are arranged.
One specific form of byte ordering is endianness.

TypeSymbol1DescriptionHow 0x12345678 is represented
Little-endian<Least significant bit stored last78 56 34 12
Big-endian>Least significant bit stored first12 34 56 78

Footnotes

  1. When specifying dataypes with endianness in numpy or [[Data Types Deep Dive#lists|array.array]]