A friend of mine in SA training on the DA-42 Twinstars...
Adelaide Tower: ABC traffic is a helicopter, Polair in your two o'clock.
ABC: Ahhh yes we've got him on TCAS
Adelaide Tower: Polair traffic in your eight o'clock, a Twinstar
(insert pause)
Polair: Not visual with traffic
Adelaide Tower: He's pretty skinny
Polair: (sounding a little bemused) We've got a light twin visual
Adelaide Tower: That's him
Cynical,
Twinstar is also an alternative (mostly US) name for a Twin Squirrel helicopter.