Ivory sheet can refer to different types of paper or board, depending on the context. Here are some of the most common meanings:

• Ivory paper: A high-quality paper with good thickness and a sturdy characteristic. It has a glossy white surface on one side and a rough texture on the other side. Ivory paper is widely used in packaging, as it can offer the ability to be printed in full-color design and is safe for containing and preserving food. It is also used for various printing techniques such as offset printing, flexo printing, or UV printing. Ivory paper can be categorized into two types: Ivory paper (FBB) and Ivory paper (SBS). Ivory paper (FBB) has one glossy side and one rough, textured side, and is usually utilized as a raw material in packaging, such as for cigarettes boxes, medicine boxes, cosmetic boxes, perfume boxes, cake boxes, fast food containers, tea and coffee boxes, among others. Ivory paper (SBS) has a white color, thick, and sturdy, and is used for various printing techniques.

• Ivory board: A highly finished paperboard coated on both sides. It is a type of paperboard that is often used for packaging, book covers, and other applications where a stiff, durable material is needed. Ivory board is usually made from a blend of hardwood and softwood pulp, and it can be coated with a variety of materials to improve its performance.

• Drawing paper: Ivory sheet can also refer to a type of paper used for drawing. In this context, it is often used interchangeably with cartridge paper. Ivory sheet drawing paper is usually thicker and sturdier than regular paper, making it more suitable for drawing and painting. It can come in different sizes and weights, and it is often acid-free and archival safe, which means it wont yellow or crumble over time.

It is important to note that the term "ivory sheet" can have different meanings depending on the context, and it is always best to clarify which type of paper or board is being referred to.