The curved toe of the shoe.

[mick]

In another thread, BigGref wrote: "Also wondered if anyone has changed a 2 to a 3. I don't see it happening but if T has a foot on the line in a gray area of coverage and I see wood b/t shoes and line, we got a situation."

That reminded me of the following.

T'other night, I had a free-throw shooter whose shoe (resting on the floor) was not touching the line, but was curved above the plane of the FT line, and penetrating the plane of the line by 3/4".

I didn't call a violation, ... but a fan did.