The Verge has published photos of the original iPhone "dev kit".

The board looks like an ordinary development kit to me, however there is a strange pattern of squares on the topmost layer. I know only of solid and hatched variants of a copper plane.

What could be the reasons to use such a pattern on a copper plane?

Aesthetics? EMC? Obfuscation?

enter image description here

  • \$\begingroup\$ There are a few duplicates of this question \$\endgroup\$ – Voltage Spike Mar 20 '19 at 17:49