| The rock was singularly striated, the scratches arranged concentrically and in helicoidal curves. |
| Each inflorescence produces 200-300 flowers that have a helicoidal repartition and open in sequence from bottom to top. |
| A charged particle placed in a chamber, in which both a magnetic and electric fields exist, acquires an helicoidal movement. |
| Througth and ascendent helicoidal system the smoke are forced to pairs in front of the flame obtain a total burnt. |
| Beacons are fastened to the strand, OPGW or bare conductor by means of helicoidal uniformed armor rods. |
| The recesses obtained depend on the structure of the knurls and may vary: straight, helicoidal or crossed. |
