What's this?…


It's an embossed "@" also know as a "commercial at".   It has a lesser-known cousin, the "commercial each", a circled "e".   This now rather lonely character has been adopted by IBM as a logo for e-commerce.

What is a "colophon"?  Well strictly speaking, it's either

I'm employing it in the more modern form where it also gives information about the tools and methods used to create the work, acknowledgments and contact information (I'm following Wired Magazine's example).