a pencil of the planes

beam pencil

Blue Pencil

Carpenter Pencil

cathode-ray pencil

drawing pencil

finite-size pencil beam

free-field blast pressure pencil sensor

generalized pencil of function method

glass pencil

harmonic pencil

indelible pencil

litmus pencil

Paper pencil test battery

parallel TLS matrix pencil

pen-and-pencil

pencil

pencil beam

Pencil beam algorithm

Pencil beam kernel