An optical device used to project images onto a surface, similar to a slide projector but usually for level projection of transparencies or documents; also called [[投影机|投影機|tou2 ying3 ji1]] or [[投影器|投影器|tou2 ying3 qi4]]

A transparent sheet used with an overhead projector to display text or images, primarily used in Taiwan

A technical drawing or picture created by projecting the shape, size, and position of an object onto a flat surface.

a method of representing three-dimensional objects in two dimensions, also known as orthogonal projection

the surface on which an object is projected, used in perspective drawing or geometry

A device used to project images or light onto a surface.

a method of mapping three-dimensional objects onto a two-dimensional surface using parallel lines that intersect the plane at an angle other than ninety degrees

the line along which an object is projected onto a surface; line of projection

a device that uses liquid crystal display technology to project video, images, or computer data onto a screen or other surface

An electronic device that connects to computers or other hardware to project images onto a screen or wall using liquid crystal display technology

The branch of geometry dealing with properties of figures that are invariant under projection

liquid crystal display projector used for displaying video, images or computer data on a screen

the branch of geometry dealing with properties that remain unchanged under projection

A drawing that represents a three-dimensional object on a flat surface; a perspective drawing

An optical device that uses light and lenses to project images or objects onto a screen; includes overhead and data projectors