There's a lot of meaning in the crucifixion . But it's a little long. If you're patient. Maybe is gotta get boring. But if you want to know, here we go.
1. BEFORE MONOTEISM, the prehistoric ancestors of israeli were sheepherds that traveled between what's today Palestine and Egypt. The FIRST FULL MOON after the spring equinox they did a ritual. It was a critical time, when the new sheeps are born. So, the patriarc of each tribe or clan would chose a newborn lamb, all white, the primogenit of a female sheep.
It would live with the family, inside the tent, so it would "absorb" the sins of all the family. Coming the full moon, the patriarc would kill it, cutting the neck, and sprinkle his family and the sheep and the lambs, washing away the sins and liberating the lambs from the demons (animals) of the desert.
Start to get it? ONE DIES FOR ALL THE OTHERS.
2. Of course you know were it is going to. In the JEWISH PASSOVER a white lamb without a single dot was killed, and the houses marked. You know that after this, the EASTERN (or PASSOVER, I don't know which is correct, English is not my mother lenguage) BECAME THE NATIONAL AND RELIGIOUS FESTIVITIE of the Israeli, and therefore, the Jews. And you know that a lamb was given as a rescue for the primogenit son.
See? A LAMB DIES TO SAVE A CHILD'S LIFE
3. What you probably don't know, is that the Jews cooked the lamb for the Easter (or Passover) just as a CRUCIFIED MAN LOOKS like. Not as barbacue style, all open, but with the rear legs togheter, crossed one over the other. It was the way they used to do it.
NOW, AN INOCENT MAN DIES TO SAVE ALL SINNERS. See the meaning of the cross? It complements the image of the innocent lamb giving its life for the others. And the image of the RESURRECTED LAMB in Revelations.
All this information was taken from a Catholic Bible, with a lot of footnotes, "LA BIBLIA LATINOAMERICA". Sorry, it's in Spanish. But you can find it in the U.S., and "THE BITTER PASSION OF CHRIST", by Ana Catalina Emmerich, the book Mel Gibson used for "The Passion".
For the crucifixion itself: it was a torture invented by the Persians, and the Romans inherited it trougth the Greeks, who also used it.
If you want to know, I'm Catholic and a catequist.
See ya.