Artifact (noun):

[1]: general term for an item made or given shape by humans, such as a tool or a work of art, especially an object of archaeological interest.

[2]: A distortion or error in digital data, caused by limitations or malfunctions of technology, which can degrade quality and integrity.

Artifact 2093 (event):

73 years after the first lockdown, a series of Artifacts were found in the preserved city of Old San Francisco.

These Artifacts are of unknown origin.