... ?

A quarter section
Of a circle,

Subtending an arc of 90 degrees,
With a movable radius for measuring angles,

Used in navigation,
Surveying and astronomy.

In a Cartesian coordinate system,
Any of the four sections formed by the intersection

Of the X

And Y axes. Moving counter-clockwise, from the upper
Right ~ hand quadrant,

The First, Second, Third, and 4th
Quadrants.

Beginning, commencement,
Opening, initiation ...