Minor Artifact
Minor Artifact in the Stellaris encyclopedia: Minor Artifacts are remnants of ancient civilizations, typically recovered through Archaeology Site excavations. While individually less potent than Relics, they can be used in various ways, such as activating unique empire bonuses or trading for valuable…
Minor Artifact in the game's words
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Minor Artifacts are remnants of ancient civilizations, typically recovered through 
Archaeology Site excavations. While individually less potent than Relics, they can be used in various ways, such as activating unique empire bonuses or trading for valuable resources.
The utility of minor artifacts depends on an empire's technological progress and policies, with some paths allowing them to be repurposed for cultural enrichment, scientific breakthroughs, or even military applications. They are managed in the 
Discoveries View.
Source: common/game_concepts (concept_minor_artifact, also concept_minor_artifacts) and localisation/english, Stellaris Cygnus v4.5.2 (9776).