Novice question on syntax in sample code

[gcjr]

@mancera1979

For what I think this is intended for (a 7-segment display)

why not

//    a      d
//   f b    c e
//    g      g
//   e c    b f
//    d h    a
//
//   h g f e d c b a

const byte SEGMENT_MAP_DIGIT[] = {
    0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0X80, 0X90
};