Question: what is the use of fn key in mac
[{'answer': 'mappable', 'provenance': [{'wikipedia_id': '3362973', 'title': 'Fn key', 'start_paragraph_id': 7, 'start_character': 373, 'end_paragraph_id': 7, 'end_character': 381, 'bleu_score': 1.0, 'section': 'Section::::Technical details.\n'}]}, {'answer': 'triggering the Dictation function', 'provenance': [{'wikipedia_id': '3362973', 'title': 'Fn key', 'start_paragraph_id': 7, 'start_character': 412, 'end_paragraph_id': 7, 'end_character': 445, 'bleu_score': 1.0, 'section': 'Section::::Technical details.\n'}]}, {'provenance': [{'wikipedia_id': '3362973', 'title': 'Fn key', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 474, 'bleu_score': 0.944475589384524, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 558040111479746891}, 'section': 'Section::::Technical details.\n'}]}]