  Trinity is a proposed air-shower imaging system optimized for the detection
of earth-skimming ultrahigh energy tau neutrinos with energies between $10^7$
GeV and $10^{10}$ GeV. Trinity will pursue three major scientific objectives.
1) It will narrow in on possible source classes responsible for the
astrophysical neutrino flux measured by IceCube. 2) It will help find the
sources of ultrahigh-energy cosmic rays (UHECR) and understand the composition
of UHECR. 3) It will test fundamental neutrino physics at the highest energies.
Trinity uses the imaging technique, which is well established and successfully
used by the very high-energy gamma-ray community (CTA, H.E.S.S., MAGIC, and
VERITAS) and the UHECR community (Telescope Array, Pierre Auger)
