The kanji 究 primarily conveys the idea of thoroughly investigating, researching, pursuing to the end, or reaching a conclusion. It suggests a deep dive into a subject or the ultimate result of such an inquiry. It often implies a process of careful examination and seeking the truth or essence of something.

・On-yomi (音読み): キュウ (kyuu) ・Kun-yomi (訓読み): きわ（める） (kiwa(meru)) - to investigate thoroughly, to master

⚫︎研究（けんきゅう） Translation: Research, study ⚫︎追究（ついきゅう） Translation: Pursuit, investigation, to pursue ⚫︎究極（きゅうきょく） Translation: Ultimate, extreme, the limit

The kanji 究 is a phono-semantic compound (形声文字). ⚫︎The top component is a simplified form of a character representing a cave or a dwelling. ⚫︎The bottom component is a form of the character representing a person. ⚫︎Together, the character suggests a person deeply investigating or delving into a cave, hence the meaning of "to investigate," "to examine thoroughly," and eventually, "to reach the ultimate end" or "to the core".