Each Chinese character and symbol is represented by two bytes. The first byte is called "high byte" (also called "area byte") and the second byte is called "low byte" (also called "bit byte"). The differences between them are as follows:

1, with different positions: the high byte is the first byte and the low byte is the second byte.

2. Different usage: 0xA 1-0xF7 is used for high-order bytes (0 1-87 area code plus 0xA0), and 0xA 1-0xFE is used for low-order bytes (0 1-94 area code plus 0xA0). ?

3. Different ranges: As the first-level Chinese characters start from the 16 area, the "high byte" range in the Chinese character area is 0xB0-0xF7, the "low byte" range is 0xA 1-0xFE, and the occupied code position is 72*94=6768. Five of them are D7FA-D7FE.

Baidu Encyclopedia-Chinese Character Coding Character Set for Information Interchange