Knight of Pentacles: tarot meaning, upright and reversed

An armoured rider holds a pentacle on a still horse before ploughed fields.
Upright
reliability · steady work
Patient and consistent effort supports a task with a long horizon.
Reversed
stagnation · rigid routine
Reliability may become inertia when circumstances require adjustment.
In a reading
The position gives this card a particular task: a description of the situation, a challenge, or guidance. Read its image and meaning alongside the other cards and the question that brought them together.
Golden Dawn correspondence
Knight / Prince (chariot): Air of Earth. 20 degrees Aries to 20 degrees Taurus. Court naming differs between decks; this identifies the Book T rank explicitly. This is the attribution in Book T.
Sources
A. E. Waite, The Pictorial Key to the Tarot. These notes are original interpretations of the Waite–Smith imagery, informed by that text.