A dangerous goods placard for Class 9 - cargo contains lithium ion batteries from the ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road).
Description of symbol: Seven vertical stripes in the upper half. In the lower half, is an accumulation of batteries, one of which is damaged and burning. Black on a white background, underlined numeral '9' in the lowest corner.
https://www.unece.org/fileadmin/DAM/trans/doc/2016/dgwp15ac2/ECE-TRANS-WP15-AC2-2016-01g.pdf
United Nations Economic Commission for Europe (UNECE)