What is the means of 5 in the fluka input line "Rblkbody 5 +blkbody -void"?

what is the means of 5 in the fluka input line “Rblkbody 5 +blkbody -void”?
and what is the function in a simulation?

Dear @Newconcept_1979,

Have a look at slide 41 of the geometry lecture: https://indico.cern.ch/event/1012211/contributions/4247788/attachments/2255261/3826586/04_Geometry_Basic_2021_online.pdf

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@ amario, thanks!