Prosodiac

Moreover, unto him [Archilochus], as firſt inventour, are attributed the Epodes, Tetrameter, Iambicks, Procritique and Proſodiacks; […]

Source: wiktionary

Moreover, one of the most natural uses of verse would be to march by; and for this purpose the triple beat would not serve without a pause. This would lead us to the paroemiac or prosodiac, and to the well known theory of [Theodor] Bergk, or the slightly different theory of [Hermann] Usener.

Source: wiktionary

Pers[ians] 694–696 = 700–702 may be regarded as consisting of two prosodiacs and a paroemiac. It is, however, better to scan the first two verses as ionic dimeters, retaining the paroemiac close, though a logaoedic rhythm […] often occurs at the end of a strophe. The assumption of ionics avoids the necessity of resolving the second arsis of the prosodiacs.

Source: wiktionary

Prosodiacs normally start with double-short —◡◡— (d) and end with single-short —◡— (s).

Source: wiktionary