A loose leaf is a piece of paper of any kind that is not bound in place, or available on a continuous roll, and may be punched so as to be organized in a ring binder. Loose leaf paper may be sold as free sheets, or made up into notepads, where perforations or glue allow them to be removed easily. "Leaf" in many languages refers to a sheet or page of paper, as in Folio, as in feuille de papier (French), hoja de papel (Spanish), foglio di carta (Italian). "Loose leaf" describes any kind of paper or book that is available in single sheets, unbound. Its "leaves", or sheets, are "loose" and not bound in notebook or book form. Design There are three common types of loose leaves: ruled paper (wide ruled or college ruled), unruled, and graph paper. College ruled paper has less space between the blue lines, allowing for more rows of writing. Wide ruled paper is intended for use by grade school children and those with larger handwriting. Companies also sell pre-printed calendar loose leaves. Special functionalities Rite in the Rain produces waterproof loose-leaf paper for outdoor (e.g. field) purposes. Accessories Card binder (for holding cards) Punched pocket (for inserting paper) Hole punch (for punching holes) Advantages and disadvantages The chief advantage of loose-leaf paper is its flexibility and economy in use. A punched sheet of paper can be inserted into a ring binder, removed for separate use, and then returned to the binder. Different sheets can be organized into a different order in a binder, or removed entirely and refiled in another binder, or disposed of as needed. This ability to rearrange and update the contents of binders is convenient for students and others, who can carry only the papers they are likely to need on a given day, while leaving the remainder elsewhere. The ability to add or remove an arbitrary number of pages has been useful for reference works that are frequently updated, such as computer software manuals, parts catalogs, and legal indexes. Or it need not be bound at all and can stand on its own as a single paper. The chief disadvantage of loose-leaf paper is that individual pages can be easily removed or lost from its storage binder due to tearing or wear of the punched holes. Adhesive reinforcement labels or sheet protectors are available to make pages more durable, and