Backslashes (\) in an abstract media item will not show in the CMS but will render in the apps. 

 Ex: If you write p\0.01 in an abstract, you will see p.01 in the media sample view in the CMS. If published to the apps (including web), your backslash will display as expected e.g. p\0.01

If you need to show the backslash in the admin site, you can use two backslashes e.g. p\\0.01. Please note that this will also display two backslashes in the app e.g. p\\0.01