black green mark circle attention warning exclamation notice Attention Green clip art 注意 綠色 黑綠色標記圈注意警告驚嘆號通知
Just another Warning sigh with exclamation mark. I made it symmetric with some gradient. The file in wiki (http://commons.wikimedia.org/wiki/File:Warning.svg) is not so symmetric. 危險 警告標誌 警告 警告標誌