Zetas

Zetas is the plural of zeta, the sixth letter of the Greek alphabet. In academic and scientific contexts, zeta appears as a symbol used to designate a variety of concepts, quantities, or identifiers, often reflecting a naming convention rather than a particular object.

The most widely known use is in mathematics and related fields through the Riemann zeta function, denoted ζ(s). This complex function is defined by a Dirichlet series for Re(s) > 1 and extended analytically to other values. It occupies a central role in analytic number theory and is connected to the distribution of prime numbers. Other uses include zeta potential, which describes the electrokinetic potential at a boundary in colloidal systems and is important for predicting the stability of suspensions, and zeta function regularization, a technique in quantum field theory and spectral theory for assigning finite values to certain divergent sums or integrals.

In astronomy, zeta is used in star designations under the Bayer system, where a given constellation may have multiple stars labeled with lowercase zeta in sequence, such as Zeta Tauri, to identify bright stars within that group.

Los Zetas refers to a prominent Mexican criminal organization formed in the late 1990s by former members of the Mexican Army and security forces. The group has been involved in drug trafficking, violence, and organized crime, and the name has become widely recognized in media and scholarly discussions about crime in the region.