The session of Tur that deals with laws of marriage and divorce is called Even HaEzer (the stone of help). Does anyone know why did he called this session like this? What does it mean?
Even Ha'Ezer contains halachot about "דיני אישות", so it would seem that the name is a play on words from "אעשה לו עזר כנגדו" which describes Hashem's creation of Chava (and women in general).
In the introduction to טור חושן משפט (Tur Choshen Mishpat), it says:
והטור השלישי אבן העזר שם עשיתי לאדם עזר כנגדו גם כשלחה גרש איך יגרשנה מנגדו וקראתיו אבן העזר יען כי הוא להועיל גם לעזר:
In my translation:
And the third column 'Even ha-'Ezer, there I made for man a help opposite him (based on Bereshit 2:18), and as he might send her, how he may divorce her from before him, and I called it 'Even ha-'Ezer ("the stone of help", based on Shemuel I 7:12), as it is to be of use and of help.