Nobody living has this. If a chart handed it to you, it is reading a transit or an orb wide enough to mean nothing.
What it looks like in a life
Neptune and Pluto were a hundred and twenty degrees apart in the 1750s and early 1760s, with Neptune in Leo and Pluto in Sagittarius. Everyone born then shared it. The next pass comes near the end of this century, around the 2080s. Because Neptune and Pluto hold their sextile for most of a century, the trine is rare and long overdue whenever it arrives. What you are more likely reading is a transit: Pluto trine your natal Neptune or Neptune trine your natal Pluto. Those come once in a life if at all, and they run as a long stretch where something ends quietly and nothing in you fights it.
The gift
The dissolving and the ending move in the same direction, so change costs almost nothing. Beliefs that have finished their work fall away without a crisis and without a fight. On a collective scale this is the tone of an era that can let go of an old religious or political consensus and not tear itself apart doing it. On a personal scale it means release without struggle.
The friction
A trine given is a trine ignored. When letting go costs nothing, nothing teaches you to value what you let go of. The drift is real: things dissolve, things end, and you notice neither, so there is no moment of reckoning. Ease at this depth turns into passivity unless something else in the chart insists.
The esoteric layer
The ancient astrologers knew neither of these planets, so nothing here is drawn from that tradition. The esoteric layer is Bailey and modern. Bailey's line on trines is direct: the triangles indicate possibility, the crosses indicate process and points of crisis. The trine is the number three, harmony moving without resistance, capital from earlier work rather than skill earned now. Bailey counts Neptune sacred and sixth ray, devotion that dissolves the separate self, and Pluto non-sacred and first ray in its destroyer function. Flowing together, they give grace at the deepest level and no obligation to use it.
Where this goes
If this is a transit for you, the houses it links say where release is currently cheap. A full natal reading shows what in your chart should be spending that ease.
Related
See it in your own chart
Cast your chart free and read this placement next to everything else you carry.