P21

P21 , P 21 or P-21 stands for:

• LÉ Emer (P21) , Irish patrol ship
• Asphyxia during childbirth (ICD-10-GM-2016-Code P21), see Asphyxia
• CDK inhibitor 1 (p21), inhibitor of cyclin-dependent kinases
• ${\displaystyle {\mathfrak {P}}}$²¹ , Papyrus 21 , New Testament manuscript

This is a disambiguation page for differentiating between several terms identified with the same word.