What does "S S" mean in a baptism register, pls?

A number of these baptisms have "S S" in the margin, and I'm having a brain freeze as to what it could stand for.

http://ift.tt/1Kwy3oy fcgi-bin%2fsse.dll%3fdb%3dlmabirths%26so%3d2%26pcat%3dB MD_BIRTH%26gss%3dangs-c%26new%3d1%26rank%3d1%26msT%3d1%26gsfn%3dfrederic k%2bcharles%26gsfn_x%3d0%26gsln%3dporter%26gsln_x% 3d0%26msbdy%3d1887%26msbpn__ftp%3dLambeth%252c%2bS urrey%252c%2bEngland%26msbpn%3d85496%26msbpn_PInfo %3d8-%257c0%257c0%257c3257%257c3251%257c0%257c0%257c0%2 57c5286%257c85496%257c0%257c%26msfng%3dfrederick%2 bcharles%26cpxt%3d1%26cp%3d11%26MSAV%3d1%26uidh%3d ykz&ssrc=&backlabel=ReturnSearchResults


Can anyone shed light for me, please?

Thanks
STG

What does "S S" mean in a baptism register, pls?