Homonym: Threshold (Limit)
A "threshold" is a term that refers to the point or level at which something begins or changes. It can be used in various contexts, such as in science, psychology, and everyday life. For example, in psychology, a threshold might describe the minimum level of stimulus needed for a person to notice a change, like hearing a sound or feeling a touch.
In architecture, a threshold often refers to the strip of wood or stone at the bottom of a doorway. This physical threshold marks the transition between two spaces, such as moving from outside to inside a building. It can symbolize new beginnings or changes in environment.