Three of Pentacles
Upright
Métier, trade, skilled labour; usually, however, regarded as a card of nobility, aristocracy, renown, glory.
Reversed
Mediocrity, in work and otherwise, puerility, pettiness, weakness.
A. E. Waite, The Pictorial Key to the Tarot (1911), Part III §2The picture
A sculptor at his work in a monastery. Compare the design which illustrates the Eight of Pentacles. The apprentice or amateur therein has received his reward and is now at work in earnest.
Older readings
If for a man, celebrity for his eldest son. Reversed: Depends on neighbouring cards.
A. E. Waite, The Pictorial Key to the Tarot (1911), Part III §4. Waite collected these and says they often disagree with the main meanings.Waite wrote in 1911 and some of his meanings show it. Tarot is a tradition of reflection, not a prediction, and no card decides anything for you.