Heh I went to try it and sure enough it was in the manpage but didn't work on the commandline because.....manpage was for /bin/kill but from the commandline I was using the builtin kill. WOW!
% kill -L
kill: unknown signal: SIGV
kill: type kill -l for a list of signals
% which kill
kill: shell built-in command
% /bin/kill -L
1 HUP 2 INT 3 QUIT 4 ILL 5 TRAP 6 ABRT 7 BUS
8 FPE 9 KILL 10 USR1 11 SEGV 12 USR2 13 PIPE 14 ALRM
15 TERM 16 STKFLT 17 CHLD 18 CONT 19 STOP 20 TSTP 21 TTIN
22 TTOU 23 URG 24 XCPU 25 XFSZ 26 VTALRM 27 PROF 28 WINCH
29 POLL 30 PWR 31 SYS
kill -9 -1 to send a KILL to every process.