The term nose cone is used to refer to the forwardmost section of a rocket, guided missile or aircraft. The cone is shaped to offer minimum aerodynamic resistance. Nose cones are also designed for travel in and under water and in high-speed land vehicles.
http://en.wikipedia.org/wiki/Nose_cone
Έχω βρει διάφορα, από πυραυλική κεφαλή ως κωνικό ρύγχος βλήματος, μήπως όμως ξέρετε αν υπάρχει κάποιος πάγιος όρος; Ευχαριστώ!