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, or other similar variations may stand for:
- pKa, the symbol for the acid dissociation constant
An acid dissociation constant, Ka, is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction known as dissociation in the context of acid-base reactions...
at logarithmic scale
- Protein kinase A, a class of cAMP-dependent enzymes
- Pi Kappa Alpha
Pi Kappa Alpha is a Greek social fraternity with over 230 chapters and colonies and over 250,000 lifetime initiates in the United States and Canada.-History:...
, the North-American social fraternity
- Public key infrastructure
Public Key Infrastructure is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a PKI is an arrangement that binds public keys with respective user identities by means of a certificate...
or PKA, Public Key Authentication
- Professional Karate Association
The Professional Karate Association was originally a martial arts sanctioning organization, now transformed into a martial arts promotion company....