THEY:
In general you point towards the various people or items that are being
referred to and use a small sweeping movement.
Sometimes if the people or items are considered a single unit or group,
you might just point at the unit or group without using a sweeping
movement.
Note:
You might see some people doing a pointing/sweeping gesture but using a
"Y" handshape instead of an index finger (pointing) handshape.
You might
also see some people spelling THY (three letters) and ending up with the
"Y" somewhat palm down.