Concept:
In AC circuits, an inductor opposes the change in current. This opposition is called inductive reactance.
Step 1: Inductive reactance is denoted by:
\[
X_L
\]
Step 2: It is given by:
\[
X_L=2\pi fL
\]
Step 3: It increases with frequency and inductance.
Therefore:
\[
\boxed{\text{Inductive reactance}}
\]