If you mean formatting the text so that it aligns with both the left and right margin settings - it's called 'justification'.
When the body is lying face up, horizontally on one's back, this is called the supine position
Stems which grow horizontally are called stolons. Stems which grow horizontally are called stolons.
This is called the lateral decuitus position. It is used mostly to look for free gas within the abdomen.
The part where you place samples on a microscope is called the stage. It is a flat platform that can be moved horizontally or vertically to position the sample for viewing through the microscope lens.
One lap
The platform on which you place the slide on a microscope is called the stage. It is where the slide is positioned for viewing and can be moved horizontally and vertically to adjust the position of the specimen under the objective lens.
This position is called short stop.
When two tectonic plates slide past each other horizontally, the boundary between them is called a transform boundary. This type of boundary is characterized by lateral movement along fault lines, such as the San Andreas Fault in California.
A transformation that slides a figure horizontally is called a translation. A transformation that slides a figure vertically is also called a translation.
The horizontal level is called the horizon.
Two triangles
A change in position of an object is called displacement. It is the vector quantity that represents the difference between the final position and the initial position of the object.