The letter Y represents an intermediate between the celestial and the spiritual in man, especially in the heavens. Historically, it is closely connected to I and J in English, particularly when it's the initial letter in a word. When it's made with curves, a letter has something of the celestial in it. (Spiritual Experiences 5620, Doctrine Regarding Sacred Scripture 90)

89. Since a marriage of the Lord and the church is present in each and every particular of the Word, it can be seen that each and every particular of the Word has the Lord as its subject, as we demonstrated to begin with in The Doctrine Regarding the Lord 1-7.

The Word also has the church as its subject, and the church likewise embodies the Lord; for the Lord teaches that a person of the church is in Him, and He in that person (John 6:56, 14:20-21, 15:5, 7).