Question: what does the sb stand for in nike sb
[{'answer': 'skateboarding', 'provenance': [{'wikipedia_id': '3519755', 'title': 'Nike Skateboarding', 'start_paragraph_id': 1, 'start_character': 117, 'end_paragraph_id': 1, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3519755', 'title': 'Nike Skateboarding', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 130, 'bleu_score': 0.9067110266941041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11097399853731899252}, 'section': 'Section::::Abstract.'}]}]