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The veil in the Temple reflects the walls/courts of separation/preference that was exercised in the Temple and in Judaism, showing a separation/preference within the Temple system, and Judaic life.
Within the Temple Courts, and according to their customs, there were varying degrees of separation/preference: Male and Female, Priest and Laity, Free and Bond (Jew or Greek/Gentile) as well as the Holy Place vs. the Most Holy Place, which separated the High Priest from the regular Priestly class. Mark 15:38, Cf. Matthew 27:51 and Luke 23:45
And the veil of the temple was rent in twain from the top to the bottom.
And that veil being rent/torn from top to bottom shows the removal/unimportance of those walls/degrees of separation/preference.
This is the metaphorical meaning of
Galatians 3:28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for you are all one in Christ Jesus.
A strictly literal reading of this verse makes no sense; as if implying humans are neither male nor female, etc...