This is the 7513th most frequent Japanese word.
八卦
"八卦" (Hakke) refers to the "Eight Trigrams," symbols from Taoist cosmology representing natural elements and forces.
In this sentence, '八卦' is used to refer to the concept in Chinese philosophy involving eight symbols used in divination.
彼は八卦を学び、占いが得意です。
He studies '八卦' and is skilled in divination.
Here, '八卦' is referenced to represent the symbolic imagery often associated with the concept.
その模様は八卦の象徴を思わせる。
The pattern is reminiscent of the symbols of '八卦'.
'八卦' in this case is used metaphorically to describe a curious and nosy personality.