PNA has many meanings according to the branch:

Navigation/Computing

• Personal Navigation Assistant (PNA)

Chemistry

• Peptide nucleic acid, an artificially synthesized polymer similar to DNA or RNA and is used in biological research and medical treatments.
• Polynuclear Aromatic Hydrocarbons, more commonly referred to as Polycyclic aromatic hydrocarbons (PAHs)
• Paranitroanilide (pNA), a group added to peptides which allows colorometric analysis of protease activity

Biology

• Peanut agglutinin, a lectin specific for Gal-β(1-3)-GalNAc

Computing

• HomePNA, a home computer networking standard using standard telephone cabling

Health (foot care)

• Partial Nail Avulsion, treatment of ingrown toenails

Horticulture

• Pna, the abbreviation for orchid genus Paphinia

Meteorology

• Pacific-North American teleconnection pattern

Transportation

• Pacific Northern Airlines
• Pamplona Airport
• Ports of Normandy Authority

Politics and Government

• Pakistan National Alliance
• Palestinian National Authority, an interim administrative organization in the Gaza Strip and parts of the West Bank
• Partido Nueva Alianza, the Spanish name for the New Alliance Party (Mexico)
• Prefectura Naval Argentina, the Spanish name for the Argentine Naval Prefecture, an Argentine coast guard force and a gendarmerie on major rivers

Society

• Polish National Alliance

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