What do you call the angled piece where the two wings of a corner desk meet?

That center piece is called the corner connector or corner wedge — it's the angled surface that joins the two straight wings into an L or corner shape. Most are a 24" x 24" quarter-round or a diagonal wedge, and the quality of this connector determines how stable the whole desk feels. Some cheaper desks leave a gap or use a flimsy joint here, so look for one with a solid surface and steel bracket reinforcement underneath. FindOfficeFurniture.com has corner desks with rock-solid connectors — call 888-719-4960 for the best deals.