This article lists the characters that you cannot use in the following names in Microsoft SharePoint:
•Site names
•Folder names
•Server names
•File names

Site names, subsite names, or site group names
•You cannot use the following characters anywhere in a site name, in a subsite name, or in a site or Active Directory group name:◦Tilde (~)
◦Number sign (#)
◦Percent (%)
◦Ampersand (&)
◦Asterisk (*)
◦Braces ({ })
◦Backslash (\)
◦Colon (:)
◦Angle brackets ()
◦Question mark (?)
◦Slash (/)
◦Plus sign (+)
◦Pipe (|)
◦Quotation mark (“)

•You cannot start a site name, a subsite name, or a site group name with an underscore (_) character or with the period (.) character.
•When you create a site name, a subsite name, or a site group name, you cannot use strings that were already used to name managed paths.
•You cannot use the period character consecutively in the middle of a site name, a subsite name, or a site group name.
•You cannot use the period character at the end of a site name, a subsite name, or a site group name.

Folder names
•You cannot use the following characters anywhere in a folder name or a server name: ◦Tilde
◦Number sign
◦Percent
◦Ampersand
◦Asterisk
◦Braces
◦Backslash
◦Colon
◦Angle brackets
◦Question mark
◦Slash
◦Pipe
◦Quotation mark

•You cannot use the period character consecutively in the middle of a folder name.
•You cannot use the period character at the end of a folder name.
•You cannot start a folder name with a period character.

File names
•You cannot use the following characters anywhere in a file name: ◦Tilde
◦Number sign
◦Percent
◦Ampersand
◦Asterisk
◦Braces
◦Backslash
◦Colon
◦Angle brackets
◦Question mark
◦Slash
◦Pipe
◦Quotation mark

•You cannot use the period character consecutively in the middle of a file name.
•You cannot use the period character at the end of a file name.
•You cannot start a file name by using the period character.
•In addition, file names and folder names may not end with any of the following strings:
◦.files
◦_files
◦-Dateien
◦_fichiers
◦_bestanden
◦_file
◦_archivos
◦-filer
◦ _tiedostot
◦_pliki
◦_soubory
◦_elemei
◦_ficheiros
◦ _arquivos
◦_dosyalar
◦_datoteke
◦_fitxers
◦ _failid
◦_fails
◦_bylos
◦_fajlovi
◦ _fitxategiak

info obtained from

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