  Symmetry properties of the order parameter are among the most fundamental
characteristics of a superconductor. The pairing symmetry of recently
discovered heavy fermion superconductor UTe2 featuring an exceedingly large
upper critical field has attracted a great deal of attention. Even though it is
widely believed that UTe2 possesses an odd-parity, spin-triplet pairing
symmetry, direct evidence for it is lacking, especially at zero or low magnetic
fields. We report here the selection-rule results of Josephson coupling between
In, an s-wave superconductor, and UTe2. The orientation dependence of the
Josephson coupling suggests very strongly that UTe2 possess an odd-parity
pairing state of B_1u in zero magnetic fields. We also report the formation of
Andreev surface bound states on the (1-10) surface of UTe2.
