ice ax 
Small ax used by the mountaineer for cutting footholds, judging snow depth, gaining a firm grip in ice or hard-packed snow, etc.
spike 
Sharp-tipped end of the shaft; it is used to cut footholds and to gain a firm grip in ice or hard-packed snow.
hammer ax 
Hammer that doubles as an ice ax; it is used to drive in pitons, cut footholds, break ice on the rock face, etc.