What is the magnifying glass icon in Fallout 4?
I noticed on a game play video of Fallout 4, a magnifying glass appears next to an object.
What is this for, and how do I activate it?
The magnifying glass is caused by tagging a particular material in the crafting interface or via Inventory (see How do you mark components and what effect does it have?). It's there to let you know that item can be broken down into a material you're looking for.