They're probably using the doorbell -- but in Ye Olde Days, provided you had extra income, they used a doorknocker. These ranged from plain to often decorative, and were cast in all kinds of metals, including brass and copper.
I have a thing for hands, and often look for them in charms and graphics.
|Ivory and bone, in case you're wondering.|
Luckily for me, the Victorians were fond of hand motifs, as well.
|This one's actually a handle.|
But doorknockers come in all sorts of shapes and themes, including animals:
|Medusa, Theseus' archenemy|
|This one's a "grotesque." (Think gargoyles.) Found in Cartegena, Columbia.|
And Just. Plain. Weird.
How-to's here on custom work:
More here. Some particularly interesting stuff here.
About a bazillion examples here, as well.
See something you really like? Many of these designs are still available -- check Pinterest or Ebay.
I had to end with this:
Strangely, we have a brother Jon...and married cousins named Phil and Dawn!
No sister Susie or Uncle Ernie, though.