The Hacker School logo is a computer [1].

The logo you're seeing with a needle is one from Etsy [2], who by the way, were the driving force behind (and are the primary benefactors of) Hacker School's grants for women.

[1] https://www.hackerschool.com/assets/logo_140.png

[2] http://kongscreenprinting.com/wp-content/uploads/2012/02/Ets...