Sesame Square is a Nigerian version of "Sesame Street", scheduled to have three seasons, one for each letter of the English alphabet, a Latin alphabet consisting of  how many letters?
English alphabet The modern English alphabet is a Latin alphabet consisting of 26 letters (each having an uppercase and a lowercase form) – exactly the same letters that are found in the ISO basic Latin alphabet:
Latin square In combinatorics and in experimental design, a Latin square is an "n" × "n" array filled with "n" different symbols, each occurring exactly once in each row and exactly once in each column. An example of a 3x3 Latin square is: