Hanging indent is the term for the bottom triangle at the 0 mark on a horizontal ruler.
Bottom of a triangle
Use for 'First Line Indent Marker' - click on triangle +hold +drag - move triangle to where you want indent of a paragraph or sentence to begin.
The bottom of the triangle is typically referred to as the base of the triangle. All triangles have a base.
The bottom of the triangle is typically referred to as the base of the triangle. All triangles have a base.
Use a ruler.
with a ruler
you use a ruler
Use a ruler.
three size
its the pointy bit
In the world of Drafting and Architecture, it is called a Scale.