The character is mapped in Unicode as U+2120℠service mark (HTML: ℠). Unlike the similar trademark symbol, there is no simple way to type the service mark symbol on Microsoft Windows, but the built-in charmap application can help. In Microsoft Outlook or Word type 2120 and Alt-X. On Macintosh systems, the symbol can be inserted by using the Character Palette. On Linux systems, it can be inserted by hitting Compose, then s and finally m.