veil
beyond the veil in a mysterious or hidden place or state, especially the unknown state of existence after death.
☞ The phrase was originally a figurative reference to the veil which concealed the innermost sanctuary of the Temple in Jerusalem; it was later taken as referring to the mysterious division between the next world and this.
draw a veil over avoid discussing or calling attention to something, especially because it is embarrassing or unpleasant.
take the veil become a nun.