Trident dream meaning is explained below using 3 different sources. Each interpretation is shown with its source.

Interpretation 1 — Patrica Telesco

(see Three, Water, Weapons)

Ancient: The union of the God aspect with that of the triune Goddess. Out of this union, tremendous creative power is born.

Alchemical: An alternative emblem for water. Note that the Greek and Roman gods Poseidon and Neptune are frequently pictured holding a trident representing their dominion over the waters and all that dwells within. Therefore, this dream may symbolize a new sense of control over your emotions.

Source: The Language of Dreams Author: Patrica Telesco

Interpretation 2 — Ariadne Green

As a harpoon associated with Triton, the ruler of the undersea, the tr.dent represents seizing the power of creative currents. As a lightning bolt from the heavers, it may be an indication of God’s power as the supreme authority.
Source: Ariadne's Book of Dream Author: Ariadne Green

Interpretation 3 — Internet Archive - Anonymous

The girl who dreams of a Trident will most certainly be loved by a sailor.
Source: Mystic Dream Book Author: Internet Archive - Anonymous