Question About --list-sigs

[jason.s.cecil.1]

Anyone know what the value that starts the line for each signature of the
public keys represents?

Ex:

pub  1024D/165767** 2002-09-25 A** (use pgp) <****@purdue.edu>
sig 3       165767** 2002-09-25   A** (use pgp) <****@purdue.edu>
sig 3       6543E1** 2002-09-25   Jason Scott Cecil (Akuma)
<akuma@purdue.edu>
sub  1024g/EC1E50** 2002-09-25 [expires: 2003-01-23]
sig         165767** 2002-09-25   A** (use pgp) <****@purdue.edu>

Someone said the 3 in "sig 3" represented the trust level?  however i
changed the trust level on a few and got the same output.  thanks so much,
can't find descrip. of this output anywhere.  please reply to
akuma@purdue.edu as i'm not on this list.

thx
jason cecil