A door seems like a simple enough thing. Yet visit your local door showroom, and you may think the salesperson is speaking a foreign language. In a way, he is: It’s the arcane terminology of doors.
Most of us are familiar with that old residential standby, the hinged door. But other doors have less obvious names. The ones that slide into a hollow space in the wall are called pocket doors (not, as you might think, sliding doors). Paired doors that slide past each other — often used for closets — aren’t called sliding doors either; they’re called bypassing doors. As a matter of fact, the only sliding door that’s actually called a sliding door is the glass kind that leads out to your patio.