Ex Libris rubber stamps are a type of custom rubber stamp that typically includes the phrase "Ex Libris" (Latin for "from the library of") followed by the owner's name. They are commonly used by book collectors, libraries, and avid readers to mark their books as personal property. Ex Libris stamps are a popular way to add a personal touch to books, journals, and other reading materials, and they can be designed and customized to include an individual's name, initials, or other desired text. They can be purchased online or at specialty stamp shops.