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little-endian

Definitions:

  The property of a byte string having its bytes positioned in order of increasing significance. In particular, the leftmost (first) byte is the least significant, and the rightmost (last) byte is the most significant. The term “little-endian” may also be applied in the same manner to bit strings (e.g., the 8-bit string 11010001 corresponds to the byte \(2^0+2^1+2^3+2^7=139\)).
Sources:
FIPS 203
FIPS 204