“The design of the tes is like a pot, a vessel with an inverted rim, representing hidden or inverted good.
Another interpretation of the tes is that it represents a man bending his head to G-d in prayer and thanks.
How are the two connected? We just explained the letter ches as representing the concept of marriage. After the union between husband and wife, then, G-d willing, there’s a conception. The tes represents the hidden good that resides within the womb (the vessel) of the mother.
This hidden good is actualized through a person’s prayers to G-d, asking Him for a healthy child.”