Examine

Examining an item or object can tell a description of the item, it's quality, damage, temperature, paint color, creator, and what it may need to be improved.

To examine an item right-click it, and select the "Examine" option. To examine an item on the ground or a ground tile double-click it. Note: the mouse double-click button, if set, may not work. Also, double-clicking an item in your inventory will activate it instead of examining it (and double-clicking items in other container inventories outside your inventory has no effect at all, oddly).