https://en.wikipedia.org/wiki/Rhapsodie ... le_(Liszt)
https://en.wikipedia.org/wiki/Blind_octave
Une autre définition en anglais :
Grove dictionary
A way of writing passage-work for the piano to produce the effect of rapid scales or arpeggios in triple octaves, more easily seen than described. The notes of the passage are taken alternately by the left and right hands in octaves in such a way that the linear movement is carried by alternate thumbs, the outer notes sounding only every other time (see ex.1). Previous editions of Grove have maintained that the device is unworthy of a serious composer, apparently on the grounds that great effects should not be purchased at bargain prices.

Je vois que certains les appellent des "interlocking octaves", "alternating octaves", "Liszt octaves".
Mais quel est le nom en français ?