BendixKing CAS 66A - Manual (Page 56)

TA Traffic Advisory. An audio and visual indication that another air-
craft is a potential threat.
TA/VSI Traffic Advisory/Vertical Speed Indicator. A flight instrument
that gives standard VSI indication and plan position of TCAS traffic.
Threat An aircraft that has satisfied TCAS threat detection logic and
thus requiring a Traffic Advisory.
Appendix
52 Effective Date 6/94 006-08746-0000 Rev 2
TCAS I Pilots Guide 2/8/06 3:52 PM Page 52