Which symbol is used to indicate a product pending FDA approval status?

The lightning bolt symbol is used to indicate that a product is pending FDA approval. This symbol serves as a visual cue for healthcare professionals and consumers that the product has not yet received formal approval from the Food and Drug Administration for safety and efficacy, and its use may be subject to additional scrutiny or restrictions.

Using this symbol helps to ensure that users are aware of the product's regulatory status, which could impact decisions regarding its use in clinical or therapeutic settings. Awareness of such status is crucial for patient safety and informed decision-making in healthcare. The other symbols mentioned do not relate specifically to FDA approval status, thus making the lightning bolt the appropriate and correct choice in this context.