if there is a line above the letter in person's name that means it's a long vowel sound
The X-axis.
No reason, it's just a useful habit. We could call it banana if we wanted.
you look at how much it goes up and call that the rise and how much it goes in the horizontal direction call the run. Slop is rise divided by run.
There is no vertical bar in a fraction. A fraction is written with either a horizontal bar or a slanted bar, which is technically called a "vinculum", but most people call it a "fraction bar".
In most situations, a MOS above 3.5 is considered a "good" quality call.
Hierarchical
The horizontal stroke across the stem of a lowercase t or f is a cross stroke.
Reference Books
Reference Books
The horizontal part of a building is called a "roof."
A horizontal half moon is called a crescent moon.
The horizontal entrance is called a portal. If there are two portals, then you call the excavation a tunnel. If there is only one, it is call a drift or adit.
The horizontal bar in a fraction is called a vinculum or, informally, a "fraction bar".
period
Latitude
Rows
The horizontal sections of the periodic table are called periods.