Final answer:
Pediatric Nurse Practitioners with PNCB credentials use the CPNP designation to signify their specialized knowledge and commitment to high standards in pediatric healthcare.
Step-by-step explanation:
Pediatric Nurse Practitioners who are credentialed through the Pediatric Nursing Certification Board (PNCB) use the credential Certified Pediatric Nurse Practitioner (CPNP). This credential indicates that the nurse practitioner has specialized knowledge in the field of pediatrics and has passed a rigorous certification exam. Holding a CPNP credential signifies a commitment to maintaining high standards of practice within the pediatric healthcare community.