Specifically, Yinwuxu is one of the twelve branches of the earth, representing the years of Yinhu, Wuxu (Horse) and Wuxu (Dog) respectively, once every twelve years.
Year: 1962, 1974, 1986, 1998, 20 10.
Afternoon year: 1966, 1978, 1990, 2002, 20 14.
Ⅶ 2006: 1970, 1982, 1994, 2006, 20 18
Generally speaking, in the year of Yin Wu, people are impulsive and fierce.
"Sound without deficiency" is a specific concept with a specific meaning and no other explanation. Because these three branches have the same nature and characteristics, that is, they are "impulsive and fierce" in this year, while other branches are not so similar. Therefore, in the tricks, "Yin Wuxu" is a special noun.
Except for this "sound is not empty", no other earthly branches can be combined into similar phrases at will.