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

The yin-yang infinity signage

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.