'Twelve' in the Bible

The sea stood on top of twelve oxen, three of which faced to the north, three of which faced to the west, three of which faced to the south, and three of which faced toward the east. The sea was placed on top of the oxen, with all of their hindquarters turned inwards.

the large bronze basin called the Sea with the twelve oxen underneath,

Twelve lions were placed on both sides of the six steps leading to the throne, and nothing comparable was made for any other kingdom.

Manasseh began to reign at the age of twelve years, and continued to reign for 55 years in Jerusalem.