An etching is a drawing made on copper by means of a needle.
"Rembrandt" by Estelle M. Hurll
It is probable that Rembrandt used a number of etching needles of different widths.
"Rembrandt's Etching Technique: An Example" by Peter Morse
His etched surfaces are never as silvery as those of Anders Zorn, who is a virtuoso in the management of the needle.
"Ivory Apes and Peacocks" by James Huneker
His skill with the etching needle had become so great that technical difficulties practically did not exist for him.
"Artists Past and Present" by Elisabeth Luther Cary
To sharpen an etching-needle, pass it over the oil-stone, holding it down flat, and turning it continually.
"A Treatise on Etching" by Maxime Lalanne
The needle shaped p+ and n+ electrodes are fabricated from etched holes which are subsequently ﬁlled with appropriate doped polysilicon.
2D Detectors for Particle Physics and for Imaging Applications