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  2. Colored pencil - Wikipedia

    en.wikipedia.org/wiki/Colored_pencil

    A variety of colored pencils. A colored pencil (American English), coloured pencil (Commonwealth English), [1] colour pencil (Indian English), map pencil, [2] pencil crayon, or coloured/colouring lead (Canadian English, Newfoundland English) is a type of pencil constructed of a narrow, pigmented core encased in a wooden cylindrical case.

  3. Grease pencil - Wikipedia

    en.wikipedia.org/wiki/Grease_pencil

    The grease pencil, a wax writing tool also known as a wax pencil, china marker, or chinagraph pencil (especially in the United Kingdom), is a writing implement made of hardened colored wax and is useful for marking on hard, glossy non-porous surfaces.

  4. Pencil - Wikipedia

    en.wikipedia.org/wiki/Pencil

    A pencil (/ ˈ p ɛ n s ə l / ⓘ) is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface.

  5. Linear system of divisors - Wikipedia

    en.wikipedia.org/wiki/Linear_system_of_divisors

    A map determined by a linear system is sometimes called the Kodaira map. Definitions ... The Cayley–Bacharach theorem is a property of a pencil of cubics, ...

  6. Pencil (geometry) - Wikipedia

    en.wikipedia.org/wiki/Pencil_(geometry)

    A pencil of planes, is the set of planes through a given straight line in three-space, called the axis of the pencil. The pencil is sometimes referred to as a axial-pencil [7] or fan of planes or a sheaf of planes. [8] For example, the meridians of the globe are defined by the pencil of planes on the axis of Earth's rotation.

  7. Mechanical pencil - Wikipedia

    en.wikipedia.org/wiki/Mechanical_pencil

    A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead , often made of graphite , is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.