Punctuation the marks hierarchically, in terms of weight". Cecil Hartley's poem identifies their relative values: <poem style=margin:4em;> The stop point out, with truth, the time of pause A sentence doth require at ev'ry clause. At ev'ry comma, stop while "one" you count; At semicolon, "two" is the amount; A colon doth require the time of "three"; The period "four", as learned men agree. </poem> The use of punctuation was not standardised until after the invention of printing. According to the 1885 edition of "The American Printer", the importance of punctuation was noted in various sayings by children such as: <poem style=margin:4em;>
Comma the comma is used to denote Logical Conjunction ("and"). The comma-separated values (CSV) format is very commonly used in exchanging text data between database and spreadsheet formats. The comma is used as a diacritic mark in Romanian under the "s" ("Ș", "ș"), and under the "t" ("Ț", "ț"). A cedilla is occasionally used instead of it, but this is technically incorrect. The symbol "d̦" ("d" with comma below) was used as part of the Romanian transitional alphabet (19th century) to indicate the sounds denoted by the Latin letter "z" or letters "dz", where derived from a Cyrillic "ѕ" (). The