What is "pyknon"

n. 1 condensation, density. 2 (context biology English) A nonrandom pattern of repeated elements, which are found more frequently in the 3′ untranslated regions of genes than in other regions of the human genome. Although it is unclear how pyknons might have arisen, it is possible that they may be involved in a new form of gene regulation.

Pyknon, , sometimes also transliterated as pycnon (from close, close-packed, crowded, condensed; ) in the music theory of Antiquity is a structural property of any tetrachord in which a composite of two smaller intervals is less than the remaining ( incomposite) interval. The makeup of the pyknon serves to identify the melodic genus (also called "genus of a tetrachord") and the octave species made by compounding two such tetrachords, and the rules governing the ways in which such compounds may be made centre on the relationships of the two pykna involved.