Dichotomy

Dichotomy (freely > doubleness?), (formal, countable noun, adj. dichotomous)
informally: beign in two minds about something,
in logic: split into two categories that are mutually exusive and jointluy exhaustive,
in botany: split into two (branches and rooots),
in astronomy: when half of an astral body is seen from earth

Yin and Yang：A shorthand explanation often describes yin and yang as woman and man, and all the other dualistic pairs, as mentioned in Jacques Lacan’s seminars: “je ne parle pas du Yin et du Yang, comme tout le monde vous savez cela : le mâle et le femelle.” ​ Although Mladen Dolar, quoted earlier, deems Chinese to be incomprehensible, he nevertheless spends a long paragraph explaining yin-yang as “two (and only two) poles of masculine and feminine.” He concludes there is a “strong thesis” in the “Taoist” symbol: “there is a relation. There is a sexual relation. Every relation is sexual.”

The short capitulation “yin and yang” or more “yin-yang” written together, showing an unconventional order of words, perhaps already hints at something different: the masculine habit of appearing first is at least reversed on the lexical level. Since one would never say yang-yin or yang and yin, one might at least pause for a moment before rushing into turning yin-yang into another symbol of the myth of a crosscultural, universal, and ahistorical patriarchy.