Here's what each part of the specification signifies:

100?H: This denotes the inductance value of the inductor, measured in Henrys (H). Inductance is a measure of an inductor's ability to store energy in a magnetic field when current flows through it. A 100?H inductor has an inductance of 100 microhenries.

I-Shaped Magnetic Core: The "I-shaped" core refers to the physical shape of the magnetic core around which the wire is wound. This core is usually made of a magnetic material like iron or ferrite, which enhances the inductor's ability to store energy efficiently.

12x15 mm: These are the physical dimensions of the inductor. It's 12 millimeters in width and 15 millimeters in length. This indicates the size of the component, crucial for fitting it into a circuit or on a circuit board. Compared to the previous example, this inductor is slightly larger.

Hole Mount: This indicates the method by which the inductor is mounted onto a circuit board or other surface. A hole mount means that the component has leads or pins that are meant to be inserted into holes on a circuit board and then soldered in place to secure it.