A hammer is the emblem of St Apollonia, a 3rd-century martyr whose sufferings included having her teeth wrenched from her jaws, and St Eloi.
In Scandinavian mythology, a hammer, Mjǫllnir, was the weapon of the god Thor.
The Hammer was a personal epithet (translating Martel) of a number of military and political figures of the Middle Ages. (Edward I of England (1239–1307), was known as the Hammer of the Scots.)
be hammered on the Stock Exchange, be declared a defaulter, from the practice of striking three strokes with a mallet on the side of a rostrum in the Stock Exchange before a formal declaration of default.
hammer and sickle the symbols of the industrial worker and the peasant used as the emblem of the former USSR and of international communism.
hammer and tongs with great energy and noise, with reference to a blacksmith's blows on the hot iron taken with the tongs from the fire of the forge. Often go at something hammer and tongs.
when all you have is a hammer, everything looks like a nail often used to comment on the wholesale application of one solution or method to the solution of any problem. The saying (which is chiefly North American) is recorded from the late 20th century.
See also the Church is an anvil that has worn out many hammers at church.