A binary digit appended to a group of binary digits to make the sum of all the digits, including the appended binary digit, either odd or even as predetermined.

• 附加在一组二进制数字后的一个二进制数位，使包括该附加二进制数位在内的所有特定的数字的和成为预定的偶数或奇数。参阅odd－evencheck。