smbclient -t <term code> can be speficied but is no longer used anywhere.
It's time to remove -t option both source and smbclient(1).
Also it remains in smbtortune and testparm.

monyo@maple:~/Work/Samba/samba-3.0.11/source$ grep term_code */*.[ch]
client/client.c:        pstring term_code;
client/client.c:        pstrcpy(term_code, KANJI);
client/client.c:        *term_code = 0;
client/client.c:                        pstrcpy(term_code, poptGetOptArg(pc));
include/rpc_misc.h:enum unistr2_term_codes { UNI_FLAGS_NONE = 0, UNI_STR_TERMI
NATE = 1, UNI_MAXLEN_TERMINATE = 2, UNI_BROKEN_NON_NULL = 3 };
rpc_parse/parse_misc.c:void init_unistr2(UNISTR2 *str, const char *buf, enum u
nistr2_term_codes flags)
torture/rpctorture.c:   pstring term_code;
torture/rpctorture.c:   pstrcpy(term_code, KANJI);
torture/rpctorture.c:   *term_code = 0;
torture/rpctorture.c:                           pstrcpy(term_code, optarg);
utils/testparm.c:       static const char *term_code = "";
utils/testparm.c:               {"encoding", 't', POPT_ARG_STRING, &term_code,
 0, "Print parameters with encoding"},