Final answer:
Sitecore restricts the use of certain characters in item names due to technical limitations and potential conflicts with system functionality.
Step-by-step explanation:
Sitecore does not allow the use of certain characters in an item name due to technical limitations and potential conflicts with the system's functionality. These characters may include special characters such as #, &, %, and +, as well as reserved characters used for encoding URLs, like /, ?, and =.
For example, if you were to include a reserved character like / in an item name, it could lead to issues when generating URLs for that item or when performing operations on that item programmatically.
To avoid these conflicts and ensure the smooth functioning of the system, Sitecore restricts the use of certain characters in item names.