Indeterminate Question Box is a line-style Icon from Sharp Line - Streamline Material set.

The Indeterminate Question Box icon shows a bold question mark framed by four separate corner brackets. Drawn in the sharp line style on a 24px grid for crisp, angular UI symbols. Use it for help prompts, unknown states, troubleshooting, and placeholder content. It belongs to Sharp Line - Streamline Material set in the Streamline Material family.