A beta β (Greek at left and Latin at right) with a down tack is used to transcribe a bilabial approximant.
Turned β (Greek and Latin), an uncommon dedicated letter for IPA [β̞]. Not in Unicode, it can be substituted with 𐅸.

Translingual

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Design

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⟨β⟩ with a down tack.

Symbol

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β̞

  1. (IPA) bilabial approximant