Question: what is the meaning of m in roman numerals
[{'answer': '1,000', 'provenance': [{'wikipedia_id': '25657', 'title': 'Roman numerals', 'start_paragraph_id': 14, 'start_character': 40, 'end_paragraph_id': 14, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Description.:A "base 10" system.\n'}]}]