What does Mark 15:37 mean?

At the ninth hour Jesus cried with a loud voice, saying, “Eloi, Eloi, lama sabachthani?” which is, being interpreted, “My God, my God, why have you forsaken me?”

Some of those who stood by, when they heard it, said, “Behold, he is calling Elijah.”

One ran, and filling a sponge full of vinegar, put it on a reed, and gave it to him to drink, saying, “Let him be. Let’s see whether Elijah comes to take him down.”

The veil of the temple was torn in two from the top to the bottom.

When the centurion, who stood by opposite him, saw that he cried out like this and breathed his last, he said, “Truly this man was the Son of God!”

There were also women watching from afar, among whom were both Mary Magdalene, and Mary the mother of James the less and of Joses, and Salome;