A Japanese Fire Prevention Ordinance 'No Hazardous Materials' sign, in vertical format. Typically posted with two additional signs at the entrances of venues where such items are prohibited by law, such as department stores, theatres, underground malls, buildings over 100 metres tall, etc. This is the current design, introduced on 1 April 2020.
Drawn according to diagrams published in Japanese Fire Prevention Ordinances.

Fire Prevention Ordinance Enforcement Ordinance - Appended Table 1-2 (related to Article 5) a Signs of prohibited acts (Archived)
Japanese government.
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