The phrase τριαίνης ταμίαν is a rare and highly specific periphrasis for Zeus. While the epithet μεγασθενῆ ('of great strength') is standard for Zeus, the genitive τριαίνης ('of the trident') is an unusual metonymy in this context. The 'trident' (τριαῖνα) is the distinctive weapon of Poseidon, not Zeus, whose primary attributes are the thunderbolt and aegis. Aristophanes employs this synecdoche here likely for metrical convenience to fit the iambic trimeter or to create a deliberate, slightly jarring comic effect by conflating the attributes of the two major Olympians, or perhaps to allude to a specific local cult or variant tradition where Zeus and Poseidon were associated with the same chthonic or maritime power (e.g., at Athens, where Poseidon and Zeus were sometimes linked in the context of the earth-shaker). However, the most plausible explanation is that the poet is using 'trident' as a generic symbol of 'sea-power' or 'storm-power' to describe the storm Zeus is about to unleash, or it represents a textual corruption where the original might have been related to a more standard Zeus-attribute. The ambiguity of attributing a Poseidonic weapon to Zeus in a serious context, juxtaposed with the comic setting of the Clouds, invites scrutiny of whether this is a deliberate stylistic blunder for humor or a rare, attested syncretism.