Meji is the Yoruba word for two, and in the naming of the odu it marks a figure whose two columns are identical. Odi Meji is therefore Odi doubled: the pattern named Odi standing in both halves of the cast. Fifteen of the sixteen principal figures carry the word, the exception being Eji Ogbe, whose name puts the same idea at the front instead.
The convention is not a flourish. Because a figure is built from two halves, every one of the two hundred fifty six odu can be named from its parts, and the compound names of the two hundred forty unmatched figures are formed by joining the names of the two columns. Meji is what marks the sixteen cases where the two names would be the same word twice. Once the sixteen are known, the whole set can be read off.
Odi Meji stands fourth in the sequence of the sixteen as it is ordinarily published. The atlas records that position because it is what the published record supports; sequences drawn from different areas do not agree in every particular, and the ordering of the figures has been treated as a research question in its own right.
The verses gathered under Odi Meji, and what a diviner makes of the figure in a consultation, are transmitted within initiated practice. They are not reproduced here, and that is a decision about what this page is for rather than a gap in it.