The odu are, among other things, a memory architecture. A tradition with no written scripture had to hold an enormous body of narrative and verse in a form that could be learned, checked, taught and retrieved under pressure in front of a client. The figures are how it did so.
Each of the two hundred fifty six signs is an address, and the material is filed under the addresses. That gives a student a syllabus with a definite shape rather than an undifferentiated mass: sixteen components to learn first, an order to learn them in, a rule for naming every combination, and a fixed set of destinations for everything learned afterwards. A senior diviner can examine a junior against it. Two diviners from different lineages can locate the same place in the corpus even where their material differs.
Ose Meji is the fifteenth of the sixteen principal figures in the published sequence and one of those addresses.
Seen this way, the notation is the durable part of Ifa and the reason a corpus of this size survived without books. It is also the part that can be described in public without difficulty, which is why these entries describe it.
What is filed under Ose Meji, and how a diviner draws a reading from it, is conferred through initiation and apprenticeship. It is not reproduced here.