I’ve seen a few examples of Islamic decor with flat long couches that have dividers interspersed regularly that act as a sort of table/armrest for people.
In the outdoor bench industry, they are called either anti-vagrant dividers or skate stoppers.
They are intended to prevent vagrants from lying down on the bench to sleep, or to prevent skateboarders, etc. from jumping onto the bench and skating along it as an obstacle. But I don’t think they are specifically Islamic in origin.