Data pad
From Halopedia, the Halo wiki
Summary
Basically a handheld computer, the Data Pad is a piece of technology used by the UNSC. Data pads store infformation, files, pictures, and sounds. They are extremely similar to the "Padd" that appears commonly in the Star Trek universe.
Dr. Catherine Halsey kept a pad of information with her about the Spartan candidates as she began to research them. She also appeared to have this technology on her glasses, as she could pull up and read files on them.
