7972steps (staircase units)TTen-USVocabulário Colaborativo em Artes e Arquitetura active approved steps (staircase units)Staircase units that consist of one tread and one riser, or any similar element providing a horizontal surface on which to support the foot of a person descending or ascending.

Source: Art and Architecture Thesaurus
http://vocab.getty.edu/page/aat/300003312 

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