What does JST stand for?

Joist

The metal latch plate in a door frame into which a doorknob plunger latches. A structural load-carrying member with an open web system which supports floors and roofs utilizing hot-rolled or cold-formed steel and is designed as a simple span member. When the electric company and telephone company dig one trench and “drop” both of their service lines in. or Wooden 2 X 8’s, 10’s, or 12’s that run parallel to one another and support a floor or ceiling, and supported in turn by larger beams, girders, or bearing walls.