I just think of the 3 vertical dots as vertical ellipsis. I often use vertical ellipsis when making a list that continues. e.g. — History of Empire and Colonia

I just think of the 3 vertical dots as vertical ellipsis. I often use vertical ellipsis when making a list that continues. e.g. — History of Empire and Colonialism — History of Religion and Society — History of Race, Gender, and Power ⋮ — History of War and Society So it naturally means "there is more stuff here" to me. YMMV