man page refers to "conventional encryption" -- does this mean symmetric?

[Daniel Kahn Gillmor]

Hi GnuPG folks--

I just noticed that a couple places in doc/DETAILS and doc/gpg.texi
refer to "conventional encryption".  Does this mean "symmetric
encryption" or something else?

More concretely, i'm assuming it refers to "SKESK[0]-prefixed SEIPD[1]
packets".  Is this correct?

In 2015, i'm not sure whether this is any more "conventional" than
PKESK-prefixed SEIPD packets.  Should the term be explained somewhere?

   --dkg

[0] Symmetric-Key Encrypted Session Key Packets
    https://tools.ietf.org/html/rfc4880#section-5.3

[1] Symmetrically-Encrypted Integrity Protected Data packets
    https://tools.ietf.org/html/rfc4880#section-5.13
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