pen register

noun

A device (originally fitted with a pen, but now purely electronic) that records all numbers called from a particular telephone line.

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Meanings

nounpen register (plural pen registers)

plural pen registers

  1. A device (originally fitted with a pen, but now purely electronic) that records all numbers called from a particular telephone line.
Cite this entry
APA

pen register. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/pen%20register

MLA

“pen register.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pen%20register. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “pen register,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/pen%20register.

Source: pen register on Wiktionary, CC BY-SA 4.0.