Nyquist criterion 

https://doi.org/10.1351/goldbook.08275
Result of information theory that a sine wave can be completely reconstructed if its ordinate is known at two or more points in a cycle.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 669 [Terms] [Paper]