This glyph represents the planet Saturn, and it corresponding alchemical metal, lead. The image mimics the scythe of Saturn, the god of the harvest and time. The qualities of Saturn include limitation, protection, and restraint; lead is therefore used historically where these qualities are required- it is still common to see lead-lined caskets, and it is traditional to keep scriptures and religious relics shielded in lead reliquaries.
Alchemically, lead was the prima matera, or primal matter, and represented the putrefaction and decay necessary for new life.
The sigil is similar to the Hebrew letter Tau, which also has associations with time and death.
|Saturn, from a medieval book of hours