gpg --list-sigs

       --list-sigs [names]
                 Same as  --list-keys,  but  the  signatures  are
                 listed too.

                 For  each  signature  listed,  there are several
                 flags in between the "sig" tag and keyid.  These
                 flags  give  additional  information  about each
                 signature.  From left to  right,  they  are  the
                 numbers  1-3  for  certificate  check level (see
                 --default-cert-check-level), "L" for a local  or
                 non-exportable  signature (see --lsign-key), "R"
                 for a nonRevocable signature (see --nrsign-key),
                 "P"  for  a signature that contains a policy URL
                 (see --cert-policy-url),  "N"  for  a  signature
                 that  contains a notation (see --cert-notation),
                 and "X" for an  eXpired  signature  (see  --ask-
                 cert-expire).