The big seal script of character Investigate is
is character Nine (Post 443), means "a person kneeling down, and his head and arms stretching forward, searching something." Here is searching in a cave which is dark and small, people need to search inside carefully, like investigation.
The small seal script of the character is
Similar to big seal script, the cave is deeper.
The clerical script of the character is
The song typeface of the character is
Same as clerical script.
究 means Investigate, Research, Study carefully, which is often used with 研（Grind, Post 444) to form a combination of words - 研究, which means Research, Study, most in academic, and scientific area. 研 means doing some fine work with patience, 究 means exploring new area and to find something new. Our research needs both the patience to keep doing good work and the courage to explore new area.
The Pinyin of the character is Jiu4.