Walking Wide Cospan

The I 𝐼 I -indexed walking wide cospan is a category whose objects are I I\sqcup\star , and whose non-identitty morphisms are of the form i 𝑖 i\to\star for i : I : 𝑖 𝐼 i:I .

Graphically, this category looks like

{\bullet}{\bullet}{\cdots}{\bullet}{\bullet}{\bullet}

A diagram over this category is a Wide Cospan.