Centering on the page or vertical allignment.
Margin is the blank space at the top, bottom, left and right sides of the document or page.
The alignment used to begin and end all lines at the same position on the left and right margins is called "justified alignment." This alignment adjusts the spacing between words in each line to achieve equal length lines on both sides.
It is called the crest, as the bottom is called a troth.
One lap
This position is called short stop.
Ragged
Any kind of lip piercing is called a labret piercing. As far as I'm aware anywhere along the bottom lip has that name, regardless of position.
This is called the header and the one at the bottom is called the footer.
The gap between bottom bed and top bed of the press is called the shut height of the press, or the distance between top of the top plate and bottom of th bottom plate in presstool .it is called as the shut height of the press tool
The page margins
Illumination
Convergent plate boundaries