Gaunt's Clock is a magical timepiece featured in the Harry Potter series, specifically in the book "Harry Potter and the Goblet of Fire." It is located in the Department of Mysteries within the Ministry of Magic. The clock is unique because it does not measure time in a conventional way; instead, it tracks the passage of time in relation to life and death. The clock has several hands that point to different states of existence, such as "Love," "Time," "Death," and "Life." Its mysterious nature reflects the themes of mortality and the unknown, making it a significant object within the wizarding world.