locus sigilli

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
LOCUS SIGILLI. The place of the seal. 2. In many of the states, instead of 
sealing deeds, writs, and other papers or documents requiring it, a scroll 
is made in which the letters L. S. are printed or written, which is an 
abbreviation of Locus Sigilli. This in some of the states has all the 
efficacy of a seal, but in others it has no such effect. See Scroll. 
    

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