Ika (|| | || ||) is the fifth Odu or Afa-du on the list of the sixteen principal Odu or Afa-du. Ika has a double line in the first position, a single line in the second position, and double lines in the third and fourth positions.
Ika is equal to 4 bits (four binary digits) like each of the other fifteen Odu or Afa-du.
A double line stands for 0 and a single line stands for 1, such that Ika (|| | || ||) is equal to 0100.
The double line and the single line correspond to broken line (Yin) and single line (Yang) respectively.
The three double lines and one single line in Ika are three split sides of three cowries and a smooth side of a cowrie, which means that there is a split side of a cowrie in the first position, a smooth side in the second position, and split sides in the third and fourth positions.