Question: what does the down arrow with a line under it mean on a keyboard
[{'answer': 'Scroll lock', 'provenance': [{'wikipedia_id': '28637', 'title': 'Scroll Lock', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28637', 'title': 'Scroll Lock', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 0.8970773746801091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15322297343704748333}, 'section': 'Section::::Abstract.'}]}]