Dragon's teeth (fortification)

Dragon's teeth are pyramidal anti-tank obstacles of reinforced concrete first used during the Second World War to impede the movement of tanks and mechanised infantry.

Interspersed among the teeth were minefields, barbed wire, and pillboxes that were virtually impregnable by the artillery and set in such a way as to give the Germans crossing fire across the entire front.

The term has survived into the present day and can be used to describe a line of posts or bollards set into the ground to deter vehicle access, for example in rural car parking areas or alongside roads.

[12] The dragon's teeth were only a component of the echeloned Russian defenses in southern Kherson: minefields, anti-tank ditches, dugouts, and trenches added to the complex.

[17] A 1,000-mile (1,600 km) stretch of the borders of Estonia, Latvia and Lithuania is to be fortified with dragon's teeth in the project Baltic Defence Line.