pocket protector

noun2

1. •
   A sheath, usually of plastic, designed to fit in a shirt pocket and hold pens and other small implements, preventing them from tearing or staining the shirt.

   • Common numbers like distances would never be expressed in megameters or nanomiles — it would bring us too close to the Dilbertian world of pocket protectors and calculator holsters. — 2009
2. •
   (US, slang) A white-collar technical worker such as a scientist or engineer, especially in military and space applications; a nerd or someone with a nerdy job.

   • It was a pocket-protector paradise, its culture defined by the HP way: paternal, collaborative, entrepreneurial, community minded and inconspicuous. — 2005