: A production strategy that organizes equipment into "cells" to improve efficiency and reduce waste. Apple unveils Apple Watch Ultra 2

: In engineering, "cellular solids" are materials like foams or honeycombs made of interconnected networks of solid struts.

Depending on where you saw this subtitle, it might also relate to:

: A critical "solid" component of the watch is its ability to automatically generate waypoints for the last available cellular signal in the Compass app , aiding navigation back to safety if you get lost. Reliable Hardware : In the Apple Watch Ultra 2

The phrase likely refers to the cellular connectivity on smartwatches like the Apple Watch Ultra 2 Go to product viewer dialog for this item.