This is most likely an emblem variant. See the [url=https://www.bungie.net/en/Help/Article/47568]Emblem Variant help article[/url] for the one by name to find its main emblem.
For example, Gambit emblem Playin' the Odds has the following variants: Primeval Prime, Ludomaniacal.
Inspect the main emblem to view and equip its variants.
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Ok i found it. It is the "Primeval Prime" symbol