The term "umbral" refers to something that is related to or resembling a shadow. It is often used in scientific contexts, particularly in astronomy, to describe the darker part of a shadow cast by an object, such as a planet or moon. For example, during a solar eclipse, the umbral shadow is the area where the sun is completely obscured by the moon. In art and literature, "umbral" can evoke themes of darkness, mystery, or the unknown. It may be used to describe settings or characters that embody shadowy qualities, creating a sense of intrigue or foreboding. This concept can be found in various works, influencing the portrayal of gothic or fantasy elements.