Serial comma toast. Adding a serial comma removes this ambiguity. Writers who normally avoid the serial comma often use one in these circumstances, although sometimes re-ordering the elements of such a list can help as well. In some circumstances using the serial comma can create ambiguity. If the book dedication above is changed to the serial comma after "Ayn Rand" creates ambiguity about the writer's mother because it uses punctuation identical to that used for an appositive phrase, leaving it unclear whether this is a list of three entities (1, my mother; 2, Ayn Rand; and 3, God) or of only two
Comma Other ascender letters with carons, such as letters "ȟ" (used in Finnish Romani and Lakota) and "ǩ" (used in Skolt Sami), did not modify their carons to superscript commas. In 16th-century Guatemala, the archaic letter cuatrillo with a comma (Ꜯ, ꜯ) was used to write Mayan languages. Comma The comma is a punctuation mark that appears in several variants in different languages. It has the same shape as an apostrophe ( ' ) or single closing quotation mark in many typefaces, but it differs from them in being placed on the baseline of the text. Some typefaces render it as