Apostrophal comma
A comma that gives the sense that a proper noun used as an intensifier will follow, but acts as an apostrophe because the intensifier is omitted.
You, John Doe, should return to your cubicle before the boss sees you.
You, (apostrophal comma) should return to your cubicle before the boss sees you.
You, (apostrophal comma) should return to your cubicle before the boss sees you.