Biscotti, which translates as “twice” (bis) “baked” (cotti), is the Italian word for cookies – they used to be baked twice so that they would last longer.
Biscotti identifies all kinds of cookies, not only the ones that are first baked in long shapes, and then in slices (also known as cantuccini).
Magari non ci avete mai pensato, ma la parola “biscotti” contiene in sé due parole diverse, ovvero “bis” (due volte) e “cotti”. I biscotti, quindi, si chiamano biscotti perché venivano originariamente cotti due volte, con lo scopo di allungarne il periodo di conservazione.