PKA may refer to:
* Professionally known as:
**
Pen name
A pen name, also called a ''nom de plume'' or a literary double, is a pseudonym (or, in some cases, a variant form of a real name) adopted by an author and printed on the title page or by-line of their works in place of their real name.
A pen na ...
**
Stage persona
*
p''K''a, the symbol for the acid dissociation constant at logarithmic scale
*
Protein kinase A, a class of cAMP-dependent enzymes
*
Pi Kappa Alpha
Pi Kappa Alpha (), commonly known as PIKE, is a college fraternity founded at the University of Virginia in 1868. The fraternity has over 225 chapters and colonies across the United States and abroad with over 15,500 undergraduate members over 30 ...
, the North-American social fraternity
* Public key authentication, establishing key authenticity in
public-key cryptography
Public-key cryptography, or asymmetric cryptography, is the field of cryptographic systems that use pairs of related keys. Each key pair consists of a public key and a corresponding private key. Key pairs are generated with cryptographic alg ...
*
Professional Karate Association
The Professional Karate Association (PKA), later Professional Karate & Kickboxing Association, now--effective March 1, 2022 PKA Worldwide--was originally a martial arts sanctioning organization, now transformed into a martial arts promotion compa ...
*
Primary knock-on atom
In condensed-matter physics, a primary knock-on atom (PKA) is an atom that is displaced from its lattice site by irradiation; it is, by definition, the first atom that an incident particle encounters in the target. After it is displaced from its i ...
, an atom that is displaced from its lattice site by irradiation
*Painkiller Already, a podcast featuring
FPSRussia
Kyle Lamar Myers (born May 9, 1986) is an American podcaster and former YouTuber known under the stage name FPSRussia and FPSKyle. His YouTube channel features Myers portraying the fictional role of Dimitri Potapov, a heavily accented "professio ...
*
Pentax KA-mount, a camera lens mount
Non-Latin
*The Latin letters ''PKA'' are visually similar to the Cyrillic acronym ', the
Russian Federal Space Agency
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