They can be called records, but that is more the case in a database than in a spreadsheet.
They can be called records, but that is more the case in a database than in a spreadsheet.
Vertical blocks are called columns.
Rows
columns
Columns
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 sections of the periodic table are called periods.
The horizontal part of a building is called a "roof."
A horizontal half moon is called a crescent moon.
The horizontal bar in a fraction is called a vinculum or, informally, a "fraction bar".
The horizontal line in the Cartesian plane is called the x-axis or x-coordinate.
The combination of a horizontal axis and a vertical axis is called a Cartesian coordinate system, or in short, a graph.