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The American Church Dictionary and Cycopedia
By reason of its shape, the Cross embroidered on the CHASUBLE (which see) is called the Y Cross, and is intended to represent the outstretched arms of our Blessed Lord on the Cross, and symbolizes the Sacrifice which He there offered for the sins of the whole world, of which the Holy Eucharist is the perpetual Memorial.
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Miller, William James. Entry for 'Y Cross'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/y/y-cross.html. 1901.