The phrase “Code Girls” does not correspond to a widely recognized, stand‑alone encyclopedic concept. It is most commonly encountered as a colloquial label applied in two related contexts:
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Historical usage – The term is employed informally to refer to the women who served as cryptanalysts and communications specialists for the United States Army and other Allied agencies during World War II. Their work involved deciphering enemy codes, operating early computing machines such as the IBM tabulators, and contributing to signals intelligence efforts. The collective activities of these women are documented in the 2017 non‑fiction book Code Girls: The Untold Story of the American Women Code Breakers of World War II (author Liza Mundy). The book draws on archival material and oral histories to illustrate the contributions of these female codebreakers, but the phrase “Code Girls” itself is not the title of an independent historical movement or organization.
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Contemporary usage – In modern technology and cultural discourse, “code girls” is sometimes used informally to denote women who work in software development, programming, or related technical fields. This usage appears in media articles, conference branding, and advocacy campaigns that aim to increase the visibility of women in computing. It functions as a gender‑specific counterpart to the generic term “code boys” or “coders,” and is not tied to a formal entity or standardized definition.
Because the expression lacks a dedicated, verifiable entry in major reference works and is not associated with a distinct institutional identity, it is treated here as a loosely applied phrase rather than an established encyclopedic term. Further scholarly study may clarify whether “Code Girls” acquires a more formalized meaning in historical or sociotechnical literature.
