Few things have been, ironically, more contentious with the man or woman in the pew in the Novus Ordo and its derivatives than the Sign of Peace.
I recall in my heyday at Pusey House the then Sacristan produced a small but strategically situated poster outside the chapel based on a traffic sign with a pair of clasped hands enclosed in a red circle and cancelled with a diagonal red line .,,. this was a Peace Free Zone.
The medieval custom followed until relatively recently was that of the server offering the osculatorium for the lips of those present at the Peace. Shawn Tribe on the Liturgical Arts Journal has an article about these items, with a splendid series of pictures of examples. Unfortunately beyond their date he adds nothing about their origin or present location. Those who follow this blog or know me will not, I think, be surprised that far and away my favourite is the first one, from 1434.
The article can be viewed at The Pax (Osculatorium or Tabula Pacis)