Position (vector)
![Space curve in 3D. The position vector r is parameterized by a scalar t. At r = a the red line is the tangent to the curve, and the blue plane is normal to the curve.](/Images/godic/202502/03/Space_curve.svg5538.png")
![Kinematic quantities of a classical particle: mass m, position r, velocity v, acceleration a](/Images/godic/202502/03/Kinematics.svg5538.png")
In geometry, a position or position vector, also known as location vector or radius vector, is a Euclidean vector that represents the position of a point P in space in relation to an arbitrary reference origin O. Usually denoted x, r, or s, it corresponds to the straight-line distances along each axis from O to P: