Blowgun Dart (3.5e Equipment)
From D&D Wiki
Blowgun darts are darts, usually fired from a blowgun but can be thrown. Any type of poison can be applied to darts. They can be made out of almost anything, but weight limits that. Each size dart can be used for the corresponding sized blowgun, or any larger size blowgun. The dart damage is added to the blowgun base damage.