Soulstamp Head (?)

In a ceramics class in ninth grade, my teacher told us to make stamps. The first thought in my head was SOULSTAMP. Therefore, a (wildly inaccurate) soulstamp was what I made. This is the...what do you call it? Head? Actual stamping part? This is the part you put ink on. (The number sixteen is in there, yes. I couldn’t help myself.)