In hooke’s law f spring equals k triangle x what does the triangle x stand for

Compression/stretching of the spring

Explanation:

Hook's law gives the relationship between the restoring force on a spring and its compression/stretching:

where

F is the restoring force on the spring

k is the spring constant, which gives a measure of the stiffness of the spring

is the difference between the spring's position and the spring's equlibrium position, so it gives a measure of the compression or the stretching of the spring, measured relative to its equilibrium position

The negative sign in the formula simply means that is a restoring force, so if is positive (stretching) the force goes in the negative direction (towards the equilibrium position), while if is negative (compression), the force goes towards positive direction (towards the equilibrium position).