BRAAAM (sometimes uncapitalized, or with varying numbers of repeated letters)[1] is an onomatopoeia used to describe a loud, low sound that became popular in trailers for action films in the 2010s. It is commonly associated with the 2010 film Inception, but the origin of the sound as it appeared in the film is disputed. The sound and its variants are often referred to as the "Inception sound", the "Inception noise" or the "Inception horn".[2]
Davis
was invoked but never defined (see the help page).