Question: what does a 0 with a line through it mean in math
[{'answer': 'empty set', 'provenance': [{'wikipedia_id': '1454130', 'title': 'Slashed zero', 'start_paragraph_id': 2, 'start_character': 46, 'end_paragraph_id': 2, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1454130', 'title': 'Slashed zero', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 92, 'bleu_score': 0.6540585844910971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10280272845990393501}, 'section': 'Section::::Similar symbols.\n'}]}]