密码芋螺（学名：Conus leopardus），是新腹足目芋螺科芋螺属的一种。主要分布于印度尼西亚、中国大陆、**，常栖息在潮下带。

Conus vexillum, common name the vexillum cone or the flag cone, is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.

These snails are predatory and venomous. They are capable of "stinging" humans, therefore live ones should be handled carefully or not at all.