Second deck is a term often used to refer to the second level of a room or structure. Synonyms for this term include mezzanine, balcony, upper level, elevated platform, and gallery. Mezzanine is typically used in reference to a small platform in a theater or restaurant, while balcony refers to an elevated area typically found in a theater or outdoor structure. Upper level is a more general term, often used to refer to the highest level of a structure. Elevated platform and gallery both suggest an elevated area used for viewing or display, and may be found in museums or art galleries.