DI-1

('di' in the first tone)

Some 64 standard Chinese characters have a 'di' pronunciation. Common sound-defining components of more complicated characters are: 氐 (11 occurences), 帝 (11),  弟 (7)

低 = low, vertically short (opposite of 'tall')

Composition of 婚:

The left part of the character is the 亻 radical. The distinctive feature of this character is on the right side, 氏. For the character 低, a dot is added.  By itself, 氏 = shi(4) is neither common nor important, but it is the distinctive element in several other important characters:

纸 = zhi(3) = paper

婚 = hun(1)= to marry