UPDATE:  SOLVED!

At 1:00 pm CDT by Stuart

Yay, it’s Saturday again and I get to torment you … er … I mean entertain you with another riddle.  I’ve had a lot of fun with these riddles, as I hope have you.

Okay, you ready?  Got your “thinking caps” on?  (Remember that expression from school, circa 1965?)  As always, the subject is something with which you’re familiar, and the first to guess the answer can choose my next post topic.  I’ve had some great topics suggested, which is one of the reasons I enjoy doing these riddles so much.

On your mark… get set… COGITATE!

Marshalite traffic signal, Melbourne Museum  Image:  Dysprosia, all rights reserved

Generally regarded as one object composed of seven parts.

One of the seven parts is famous.

This has been well-known since antiquity.

It was completely ignored by Homer, even though it was very important to Phoenician sailors.

Wooden sailing boat, Image:  Uwe Kils, some rights reserved

The object has a sibling, which has been known as both sister and brother.

Through mythology and popular culture, this has been well-known as six different things.

There is something very interesting and unusual about four of its members.

February 1934 cover of pulp magazine Mystery

Know the answer yet?  I’ve left some very obvious clues, and a couple which are more obscure.  I have been known to leave a few red herrings laying about.  I’ll see you (so to speak) in the comment section.

Good luck!