What is component 3 in figure T-3?

Component 3 in figure T-3 is a variable inductor. The coil symbol shows inductance, and the diagonal arrow shows that it is adjustable.
Technician · FCC Element 2 · answer reveals automatically

Component 3 in figure T-3 is a variable inductor. The coil symbol shows inductance, and the diagonal arrow shows that it is adjustable.