{'fraction_non_alphanumeric': 0.016548463356973995, 'fraction_numerical': 0.004728132387706856, 'mean_word_length': 5.838709677419355, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Symbol Sign Understandability When Visibility is Poor

Subjects viewed slides of symbol signs under difficult viewing conditions, simulating a building emergency situation. The subject indicated whether a symbol meant “exit” or not. Substantial differences in understandability were found among 18 exit symbols. Features that contributed to correct identification of exits and confusion from other messages were identified.