Wire gauge is a measure of wire thickness. Don't let the fact that the gauge number goes up as thickness decreases confuse you.
How to Choose the Right Wire
House and Components
How To Ground an Ungrounded Outlet
Electrical Wire Gauge, Ampacity, and Wattage Load
Home Electrical, Heating and Cooling Systems
home
What Gauge Wire for Landscape Lighting? - Infinity Cable Products
Amplifier wire gauge chart
Wire Gauge Chart American Wire Gauge (AWG) Wire Size Chart