Question: what is the symbol of a circle with a line through it called
[{'answer': 'international prohibition sign'}, {'provenance': [{'wikipedia_id': '507648', 'title': 'No symbol', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 411, 'bleu_score': 0.768077371402885, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14472330287240370715}, 'section': 'Section::::Abstract.'}]}]