It is the origin, with coordinates (0, 0). It is normally denoted by O.
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The origin.
It is the point of origin which is at (0, 0)
Those are the four "quadrants".
it's the point of intersection or sth
Each point in the plane can be associated with an ordered pair of numbers, called the coordinates of the point. Also, each ordered pair of numbers can be associated with a point in the plane. To set up a coordinate system, we can also choose two perpendicular lines, one horizontal, as the x-axis, and the other vertical, as the y-axis, and designate their point of intersection as the origin. Points with x-coordinate 0, lie in the y-axis; points with y-coordinate 0, lie in the x-axis; the coordinates of the origin, 0, are (0.0).