双生铰链

Gemel \Gem"el\, n.
1. One of the twins. [Obs.] --Wyclif.

2. (Heb.) One of the barrulets placed parallel and closed to
each other. Cf. {Bars gemel}, under {Gemel}, a.

Two gemels silver between two griffins passant.
--Strype.

{Gemel hinge} (Locksmithing), a hinge consisting of an eye or
loop and a hook.

{Gemel ring}, a ring with two or more links; a gimbal. See
{Gimbal}.

{Gemel window}, a window with two bays.