In Sefer Yetzirah, the ‘King’ of Space is said to be the Axis (Teli תלי), the imaginary line that the universe revolves upon. This is represented in this picture by the blue ‘line’ in this picture.
The ‘King’ of Time is the Cycle (Galgal גלגל) because we relate to time as cyclical. This is represented by the red ‘circle’ in this picture.
The Sefer Yetzirah (Book of Creation) teaches the mysteries of the Twenty-two Hebrew letters. The alphabet is presented there as three groups of letters. One group is called the Three Mothers. The second group is called the Seven Doubles. The third group is called the Twelve Elementals.