The system of cantillation signs used throughout the Tanakh is replaced by a very different system for these three poetic books. Many of the signs may "appear" the same or similar at first glance, but most of them serve entirely different functions in these three books. (Only a few signs have functions similar to what they do in the rest of the Tanakh.) The short narratives at the beginning and end of Job use the "regular" system, but the bulk of the book (the poetry) uses the special system. For this reason, these three books are referred to as "sifrei emet" (Books of Truth), the word "emet" meaning "truth", but also being an acronym (אמ״ת) for the first letters of the three books (Iyov, Mishle, Tehillim).