This is one of the cards in Kipper that may or may not strictly adhere to its literal meaning. While in some contexts and card combinations it might signal a matrimonial union, in most cases it actually stands for connections in all their forms. Sometimes, it merely connects the two cards it stands in between, thus signaling a business contract or an agreement. In this it is similar to the Ring in Lenormand.
If a romantic relationship itself is the main focus of the reading, this card will be the significator for its current state (thus the name “State of marriage”) and the images around it will describe its condition and outline any future prospects the union might possess. As already mentioned, it tends to stand for connections of all kinds, including friendships and business partnerships. In a work-related reading, it can correspond to teamwork but also permanent employment.
In readings regarding a person’s health and physical well being (which, in my opinion, should only be conducted by someone in the medical profession, and even then with a large dose of caution), card number three can stand for the stomach, intestines and liver.