Any character may be used to separate the values, but the most common delimiters are the comma, tab, and colon. The vertical bar (also referred to as "pipe") and space are also sometimes used. In a comma-separated values (CSV) file the data items are separated using commas as a delimiter, while in a tab-separated values (TSV) file, the data items are separated using tabs as a delimiter. Column headers are sometimes included as the first line, and each subsequent line is a row of data. The lines are separated by newlines.