A quantum number, either+1(even) or-1(odd), that mathematically describes this property. 量子数的均衡从数学含义来描述对称性的量子数＋1（偶）或－1（奇）
In binary floating-point concepts, a value with an associated sign which is mathematically greater in magnitude than any binary floating-point number. 在二进制浮点数中，一种带有符号的特定值，其量值大于一台计算机所能表达的任何二进制浮点数。
