Katina (ġebla)

perpend stone, perpend (parpen, parpend, perpin, and other spellings),through stone, bond stone, or tie stone is a stone that extends through an entire wall’s width, from the outer to the inner wall. Such stones are especially used to lock two wall layers structurally together.

Tkellem mal-ħajt

Expression: ‘Spoke to the wall’ – stated of someone who is trying to communicate but cannot get through, or gave advice to someone but was ignored.