A whistle originating in ancient times used to pipe orders aboard ship. Set combinations of high and low notes would have a specific meaning. Still in general use to "pipe the side" and to pass general orders.
Umlozi osukela kwixesha lamandulo wawusetyenziselwa ukudlulisa imiyalelo yokukhwela enqanaweni. Ukubekwa kokudityaniswa kweeenowuthsi eziphantsi neziphezulu kungaba nentsingiselo engqalileyo. Lisasetyenziswa nje jikelele "ekudluliseleni ecaleni" nokudlulisela imiyalelo eqhelekileyo.