Notary Bulletin Hotline TIp: What Is 'Locus Sigilli'? By NNA Staff on June 06, 2009 in Hotline Tips Some notarial certificates are marked with the initials "L.S." which stands for the Latin phrase "locus sigilli" meaning "location of the seal." This is used to mark the area where the seal is affixed. While an embosser seal can be affixed over the letters, an ink seal should be placed near, but not covering, the "L.S." Email Share Leave a Comment Required * Name * Email *(for verfication purposes only) Comment * Enter the text shown in this image *(text is case sensitive)All comments are reviewed and if approved, will display.