What does SPNG stand for?

Spbing

Spring

Rope from after part of a vessel led outside and forward to a point of attachment outside vessel By heaving on it ship can be moved ahead Sometimes led to anchor cable, for casting ship's head. Tendency of a vessel's head to come nearer to wind. The opening of a seam. Partial fracture in a mast or spar.

Sponge

A form of metal characterized by a porous condition that is the result of the decomposition or reduction of a compound without fusion. The term is applied to forms of iron, titanium, zirconium, uranium, plutonium and the platinum-group metals.