PNA

PNA or Pna has a variety of meanings:

Science and Engineering

abbreviation for orchid genus Paphinia
4-Nitroaniline - chromogenic substrate, also known as para-Nitroaniline
Pacific–North American teleconnection pattern, a climatic phenomenon
Parisiensia Nomina Anatomica - the revision of anatomic nomenclature.
Peanut agglutinin, a lectin specific for Gal-β(1-3)-GalNAc
Peptide nucleic acid, an artificially synthesized polymer similar to DNA or RNA.
Plastic neutral axis, an engineering value for plastic material.
Polynuclear Aromatic Hydrocarbons, more commonly: Polycyclic aromatic hydrocarbons (PAHs)
Programmable Network analyzer (electrical)
Protected Natural Area (disambiguation)
Pottery Neolithic A, a division of the Pottery Neolithic period in archaeology

Algerian National Party
Pakistan National Alliance
Palestinian National Authority, an administrative autonomous government in parts of the West Bank and the Gaza Strip
Project for Nuclear Awareness, a non-profit organization that advocates for the abolition of nuclear weapons by educating the public and policy makers
Partido Nueva Alianza, the Spanish name for the New Alliance Party (Mexico)
Parties to the Nauru Agreement
Pennsylvania Newspaper Association
Philippine Nurses Association
Polish National Alliance
Prefectura Naval Argentina, the Spanish name for the Argentine Naval Prefecture
National Anticorruption Directorate, Romania; formerly, National Anticorruption Prosecution Office (PNA)

Postnatal age, a parameter used to identify the age of newborns^[1]
Ingrown nail#Nail avulsion (Partial Nail Avulsion), a treatment of ingrown toenails.
Pneumonia, an infection of the lungs.
Psychiatric nursing assistant

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