1) Measure of land = one quarter of an acre. The word was also used for a Perch.
2) The holy Cross. Many legends and lessons grew up around the symbol. One has the Cross itself being made of three kinds of tree: cypress, cedar and pine. This was seen as a symbol of the Trinity. These trees had grown from seeds given to Seth by an angel, which had been placed under the tongue of Adam on his death. One of the earliest English poems is the Dream of the Rood, parts of which were carved on the stone cross still to be seen at Ruthwell in Scotland.
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.