Triphosphopyridine nucleotide (TPN) is a coenzyme found in living organisms that is involved in energy production. It is also known as nicotinamide adenine dinucleotide phosphate (NADP) and is often used interchangeably with TPN. Other synonyms for this vital coenzyme include triphosphopyridine nucleotide phosphate (TPNP), coenzyme II, and oxidized nicotinamide adenine dinucleotide phosphate (NADP+). In addition, there are other variations of this coenzyme that have specific enzymatic roles such as nicotinamide adenine dinucleotide phosphate (NADPH) and reduced nicotinamide adenine dinucleotide phosphate (NADPH2). The various synonyms for TPN highlight the importance of this coenzyme in cellular metabolism and energy production.