I shall call him Squiggly Piggy.

As you know, one use of brackets ("[xx]") is to insert an editorial comment of some kind within quoted material.

The author of the manuscript which I just started to edit, consistently uses squiggly brackets ("{xx}") instead. I can't recall ever seeing squigglies outside of computer programming language or advanced mathematical formulas.

Squigglies have no place in civilized society.