pencil (EN)

noun, verb

noun “pencil”

1. a thin, cylindrical tool used for writing or drawing, consisting of a graphite core encased in wood
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   She drew a beautiful landscape using only a pencil.
2. (in optics) a beam or collection of rays of light that converge at or diverge from a point
   The scientist observed a pencil of light emerging from the prism.
3. (in geometry) a family of geometric objects sharing a common property, such as lines passing through a single point
   In mathematics class, we studied the pencil of lines that pass through a single point.

verb “pencil”

1. to write or draw something using a pencil
   She penciled a quick note in her journal before leaving.