The App Window Warning icon shows a browser window with three controls and an overlapping warning triangle containing an exclamation mark. Drawn in the duotone style on a 24px grid with a 1px stroke, it uses colored fills and clear outlines for depth at compact UI sizes. Use it for browser errors, application warnings, failed page states, system alerts, and troubleshooting screens. It belongs to Ultimate Duotone set in the Ultimate family.
