Biscotti (bee-SKAWT-tee):
 
In Italian, biscotti means, "twice cooked." The word biscotto is derived from bis (twice) and cotto (cooked). Biscotti is also the generic term for cookies in Italian. The dough is formed into logs and baked until golden brown. The logs are then sliced, and the individual biscotti are baked again to give them their characteristic dryness. The shelf life of biscotti are three to four months without preservatives or additives. Other countries have their version of this cookie - Dutch rusk, French biscotte, and the German zwieback

According to the Arnott Biscuit Company:

One of the earliest records dates biscuits back to second century Rome. Biscuit comes from the Latin word 'bis coctum' which means, 'twice baked'. Back then, 'biscuits' were unleavened, hard, thin wafers, which had a low water content. As they contained very little moisture they were the ideal food to store, as they wouldn't become mouldy quickly.

Early Seaman’s biscuits, also known as hard tack, probably were the first version of biscotti. They were the perfect food for sailors who were at sea for months at a time on long ocean voyages. The biscuits were thoroughly baked to draw out the moisture, becoming a cracker-like food that that was resistant to mold. Biscotti were a favorite of Christopher Columbus who relied on them on his long sea voyage in the 15th century. Historians believe that the first Italian biscotti were first baked in 13th century Tuscany in the in a city called Prato.