The integer formats s, S, i, I, l, L, j, and J
...
For example, a 4-byte integer 0x12345678 (305419896 decimal) would be ordered natively (arranged in and handled by the CPU registers) into bytes as

    0x12 0x34 0x56 0x78  # big-endian
    0x78 0x56 0x34 0x12  # little-endian