Popular tetrad bases include orthonormal tetrads and null tetrads. The index notation for tetrads is explained in tetrad (index notation). Divine triads, tetrads, and ogdoads in Gnostic thought often are closely related to Neo-Pythagorean arithmology. It grows in tetrads, irregular clusters, and cubical packets of eight. Their pollen grains are triporate or multiporate and released in tetrads. The poly G tails form intermolecular tetrads that result in high molecular weight aggregates. It has pentads, tetrads, and triads as well as hexanies and dekanies. Its pollen is shed as permanent tetrads. The pollen is shed as permanent tetrads. Arrangements include pairs, tetrads, clusters, chains and palisades. Its pollen is shed as permanent tetrads. . They appear normally in tetrads and sometimes in pairs. We first need to introduce the notion of tetrads. These are divided into four tetrads (i.e., sets or groups of four). Similar relationships with diads exist for tetrads.