That's a tangent to the circle.
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tangent
In geometry, the line segment that goes from one point to the other point where a line intersects a circle.
No, a tangent is a line that intersects a circle at exactly one point. The radius of a circle is the distance from the center of the circle to any point on the perimeter of the circle.
A secant is a line that passes through a point on the circle and the center of the circle. It intersects the circle at two different points.
A line tyhat's tangent to a circle intersects the circle in exactly one single point. The radius drawn to that point is perpendicular to the tangent.