Manchu alphabet the West it is treated like an alphabet. The alphabetic approach is used mainly by foreigners who want to learn the language, as studying the Manchu script as a syllabary takes a longer time. The Manchu alphabet has two kinds of punctuation: two dots (), analogous to a period; and one dot (), analogous to a comma. However, with the exception of lists of nouns being reliably punctuated by single dots, punctuation in Manchu is inconsistent, and therefore not of much use as an aid to readability. The equivalent of the question mark in Manchu script consists of some special
Comma category by Lawvere, which involved the comma punctuation mark. Although standard notation has changed, since the use of a comma as an operator is potentially confusing, and even Lawvere dislikes the uninformative term "comma category" (Lawvere, 1963 p. 13), the name persists. The most general comma category construction involves two functors with the same codomain. Often one of these will have domain 1 (the one-object one-morphism category). Some accounts of category theory consider only these special cases, but the term comma category is actually much more general. Suppose that formula_1, formula_2, and formula_3 are categories, and formula_4 and formula_5 (for source