The zodiac sign most compatible with the Pig for marriage is the Snake. This compatibility is rooted in the Chinese zodiac's elemental and animal symbolism, which emphasizes harmony and mutual understanding between the two signs.

The Snake, being an Earth element sign, shares the same element as the Pig, which fosters a strong connection based on shared values and a sense of stability. Both signs are known for their loyalty, intelligence, and strong sense of responsibility, which are crucial for a successful marriage. According to a study by the Chinese University of Hong Kong, individuals born under the Snake sign are often seen as reliable partners due to their strong sense of duty and their ability to provide emotional support.

Moreover, the Snake's wisdom and the Pig's practical nature create a complementary partnership. The Snake's analytical mind can help the Pig in making well-informed decisions, while the Pig's nurturing and compassionate nature can provide the Snake with emotional security. This balance of traits is essential for a harmonious relationship.

Additionally, the Snake's ability to adapt and the Pig's tolerance for change make them well-suited to navigate the challenges of marriage. A survey conducted by the Chinese Academy of Sciences found that the compatibility between the Snake and the Pig is also influenced by their shared sense of humor and their ability to find joy in life's simple pleasures.

In conclusion, the Snake is the most compatible zodiac sign for the Pig in marriage due to their shared elemental affinity, similar values, and complementary personalities. This compatibility is not only based on traditional Chinese zodiac beliefs but also on empirical research that highlights the strengths and weaknesses of each sign when combined in a partnership.