♄

The Greek letters kappa-rho with an abbreviation stroke at bottom, for Κρόνος (Krónos), the Greek equivalent to the Roman god Saturn. The cross at top was added later, to Christianize the symbol of a pagan god.[1]

Use of ♄ for Saturday, on the left side of the calendar dial of this 16th-century clock-calendar, just above the day-of-the-week hand.

♄

1. (astronomy, astrology) Saturn.
2. (alchemy, archaic) lead.
3. (Can we verify⁽⁺⁾ this sense?) (botany, obsolete) woody perennial plant.

   (the orbital period of Saturn is 30 years)[2]

4. (rare) Saturday.

   Refers to the Latin phrase dies Saturni, which literally means "Saturn's day".

• (alchemy): 🜪 – lead ore.

• 
  Late Classical and Medieval forms
• 
  The Saturn symbol before the cross was added
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  A decorative variant in the Netherlands
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  As a symbol for lead
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  An abstract variant
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  Symbol on a royal-blue background
• 
  Mariner logo
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  Transit of Saturn