of Mesekhet Berachot ("Benedictions") is called Me-ematai ("From when"). This word is printed at the head of every subsequent page within that chapter of the tractate. In rabbinic usage, the incipit is known as the "dibur ha-matḥil" (דיבור המתחיל), or "beginning phrase", and refers to a section heading in a published monograph or commentary that typically, but not always, quotes or paraphrases a classic biblical or rabbinic passage to be commented upon or discussed. Many religious songs and prayers are known by their opening words. Sometimes an entire monograph is known by its "dibur hamatḥil". The published mystical and exegetical discourses of the Chabad-Lubavitch rebbes (called "ma'amarim"), derive their titles almost exclusively from the "dibur ha-matḥil" of the individual work's first chapter. Ancient Greek The final book of the New Testament, the Book of Revelation, is often known as the Apocalypse after the first word of the original Greek text, ἀποκάλυψις apokalypsis "revelation", to the point where that word has become synonymous with what the book describes, i.e. the End of Days (ἔσχατον eschaton "[the] last" in the original). Medieval Europe Incipits are generally, but not always, in red in medieval manuscripts. They may come before a miniature or an illuminated or historiated letter. Papal bulls Traditionally, papal bulls, documents issued under the authority of the Pope, are referenced by their Latin incipit. Hindu texts Some of the mantras, suktas from the hymns of the Vedas, conform to this usage. Modern uses of incipits The idea of choosing a few words or a phrase or two, which would be placed on the spine of a book and its cover, developed slowly with the birth of printing, and the idea of a title page with a short title and subtitle came centuries later, replacing earlier, more verbose titles. The modern use of standardized titles, combined with the International Standard Bibliographic Description (ISBD), have made the incipit obsolete as a tool for organizing information in libraries. However, incipits are still used to refer to untitled poems, songs, and prayers, such as Gregorian chants, operatic arias, many prayers and hymns, and numerous poems, including those of Emily Dickinson. That such a use is an incipit and not a title is most obvious when the line breaks off in the middle of a grammatical unit (e.g., Shakespeare's sonnet 55 "Not marble, nor the gilded monuments"). Latin legal concepts are often designated by the first