Nautilus Shell

A nautilus shell is an item that is used for crafting conduits.

Fishing
Nautilus shells can be obtained as a 'treasure' item from fishing.

You can also steal them from pigs and Endermen

Drowned
3% or 8% of Drowned will spawn with a nautilus shell that will always be in their offhand, and they will always drop it when killed, since drowned always drop equipment in their offhand.

Crafting ingredient
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Trivia

 * Nautiluses are animals, which occupy deep oceans in the real world. However, they seem to be absent in Minecraft, as there are currently no plans to add nautilus mobs into the game.

Issues
Nautilusschale Coquille de nautile Nautilusschelp Muszla łodzika Concha de Náutilo Раковина наутилуса Nautilus Shell 鹦鹉螺壳