| Symbian installation source | |
| Extension: | .sis |
| Mime: | application/vnd.symbian.install |
| Owner: | Symbian Ltd. |
| Genre: | Installation |
| Container For: | Symbian applications |
| Standard: | Symbian |
SIS is an acronym that stands for Symbian Installation Source. It is an installation file for Symbian OS, and not an application file, as sometimes believed; the real Symbian application is the .APP file.