What term refers to a short text honoring a deceased person that is inscribed on their tombstone or plaque?

The term that refers to a short text honoring a deceased person that is inscribed on their tombstone or plaque is "epitaph." An epitaph is specifically crafted to commemorate the individual and often conveys a message reflecting their life, character, or beliefs, usually in a poetic form or with poignant sentiment.

An obituary, while also an expression of remembrance, is a written notice that typically appears in newspapers and other media announcing a person's death and detailing their life and contributions. It serves a broader purpose than simply inscribing a tribute on a tombstone.

An inscription can refer to any engraved text on a surface and is not limited to those honoring the deceased; it may include names, dates, or messages that are not necessarily memorial in nature.

Memorial, as a term, refers to the broader act of remembering or honoring someone who has passed away and can encompass various forms such as ceremonies, services, and structures. However, it does not pinpoint the specific short text found on a tombstone or plaque.

Thus, the correct choice emphasizes the particular nature of an epitaph as it relates directly to memorializing the deceased in a concise and respectful manner on their grave marker.