human billboards
...that sandwich board-wearing human billboards gave rise to the term "sandwich man"?
...that <a href="./Sandwich_board" id="mwDh0" rel="mw:WikiLink" title="Sandwich board">sandwich board</a>-wearing <b id="mwDh4"><a href="./Human_billboard" id="mwDh8" rel="mw:WikiLink" title="Human billboard">human billboards</a></b> <i id="mwDiA">(pictured)</i> gave rise to the term "sandwich man"?