The prompt book, also called transcript, the bible or sometimes simply the book, is the copy of a production script that contains the information necessary to create a theatrical production from the ground up. It is a compilation of all blocking, business, light, speech and sound cues, lists of properties, drawings of the set, contact information for the cast and crew, and any other relevant information that might be necessary to help the production run smoothly.
In modern theatrical productions, the prompt book is generally maintained and kept by the stage manager, with differences in the specific construction and organization to suit the style of the stage manager keeping the book, and the type of production (legitimate theatre, musical theatre, dance, opera, etc.).
