Editing Zeta (section)

===Mathematics and science {{anchor|Symbols}} ===
The uppercase zeta is not used, because it is normally identical to Latin [[Z]]. The lower case letter can be used to represent:
*The [[Riemann zeta function]] in [[mathematics]]<ref>{{Cite web |last=Weisstein |first=Eric W. |title=Riemann Zeta Function |url=https://mathworld.wolfram.com/RiemannZetaFunction.html |access-date=2025-01-22 |website=mathworld.wolfram.com |language=en}}</ref>
*The [[Hurwitz zeta function|Hurwitz Zeta Function]] in mathematics<ref>{{Cite web |title=DLMF: Chapter 25 Zeta and Related Functions |url=https://dlmf.nist.gov/25 |access-date=2025-01-31 |website=dlmf.nist.gov}}</ref>
*The [[Weierstrass functions#Weierstrass zeta-function|Weierstrass zeta-function]]<ref>{{Cite web |last=Weisstein |first=Eric W. |title=Weierstrass Zeta Function |url=https://mathworld.wolfram.com/WeierstrassZetaFunction.html |access-date=2025-01-22 |website=mathworld.wolfram.com |language=en}}</ref>
*The [[damping ratio]] of an oscillating system in engineering and physics<ref>{{Cite book |last=Wilkie |first=Jacqueline |title=Control engineering: an introductory course |last2=Johnson |first2=Michael |last3=Katebi |first3=Reza |date=2002 |publisher=Palgrave |isbn=978-0-333-77129-7 |location=Basingstoke |pages=179 |quote=We shall refer to ζ as the damping ratio throughout this text.}}</ref>
*The rotational quantity of angular [[Jerk (physics)|jerk]] in physics<ref>{{Cite book |last=Gallardo-Alvarado |first=Jaime |title=Mechanisms: kinematic analysis and applications in robotics |last2=Gallardo-Razo |first2=José |date=2022 |publisher=Academic Press, an imprint of Elsevier |isbn=978-0-323-95348-1 |series=Emerging methodologies and applications in modelling, identification and control |location=London |pages=328}}</ref>
*The effective nuclear charge on an electron in quantum chemistry
*The [[electrokinetic potential]] in [[colloid|colloidal systems]]<ref>{{Cite book |last=Hunter |first=Robert J. |title=Zeta potential in colloid science: principles and applications |date=1988 |publisher=Academic Press |isbn=978-0-12-361961-7 |edition=New paperback |series=Colloid science |location=London San Diego |pages=6 |quote=It is also possible to correlate the ζ-potential with the sedimentation behaviour of colloidal systems and with the flotation behaviour of mineral ores.}}</ref>
*The lag angle in [[helicopter]] blade dynamics<ref>{{Cite book |last=Padfield |first=Gareth D. |title=Helicopter flight dynamics: the theory and application of flying qualities and simulation modeling |date=2007 |publisher=American Inst. of Aeronautics and Astronautics |isbn=978-1-56347-920-5 |edition=2nd |series=AIAA education series |location=Reston, Va |pages=xxxi}}</ref>
*Relative [[vorticity]] in the [[atmosphere]] and [[ocean]]
*A number whose discrete values (eigenvalues) are the positive roots of transcendental equations, used in the series solutions for transient one-dimensional conduction equations
*The heat flux across or through a plane (industrial materials technology)
*In physical chemistry equilibrium computations (using lower case Zeta (ζ)), the extent of reaction
*The [[Boundary layer thickness|height of the surface]] of a fluid layer

[[ZETA (fusion reactor)]] (all uppercase) was an early fusion experiment.

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