A backslash inside a tag value is represented by two adjacent backslashes. RTF is programmed by using groups, a backslash, a control word and a delimiter. Unix uses a forward slash (/) to delimit components whereas Windows uses a backslash (). Besides replacing the backslash with the yen character, multi-byte characters can also include ASCII bytes. Due to limitations of the tokenizer, raw strings may not have a trailing backslash. To insert a literal backslash, one must double it, e.g. . The PostScript language and Microsoft Rich Text Format also use backslash escapes. TeX commands commonly start with a backslash and are grouped with curly braces. This raises the issue of how to represent an actual backslash inside a literal. The backslash here denotes the set difference. A slash in the reverse direction () is known as a backslash. Multiple characters can follow the backslash, such as codice 42, depending on the escaping scheme. Other languages use an escape character, often the backslash, as in codice 4. In such cases the code for a backslash is being drawn as these characters. An actual backslash is produced by a double backslash .