The Two of Coins is the most historically informative card in the entire deck, and almost nobody reads it that way.
In the French woodblock patterns the two coins are joined by a ribbon or scroll forming a long loop, and that scroll is not decorative: it is a cartouche, and printers used it to sign their work. Surviving Marseille-pattern Twos of Coins carry cardmakers' names, cities and sometimes dates, printed into the design. In a period when playing cards were taxed and regulated, the maker's mark was a legal requirement as much as a boast.
This is why the card can be dated when others cannot, and why it is disproportionately useful to historians of the deck. The scroll is a shop sign.
Pamela Colman Smith kept the loop in 1909 and turned it into a lemniscate, the figure-eight of infinity, held by a dancing juggler balancing two coins. The occult reading of the card as cycles, flux and eternal exchange follows from that reinterpretation of a printer's ribbon. It is a good reading. Its source is a trade mark.
In practice the card is read for juggling: two commitments held at once, cash flow, adaptability, and the specific competence of keeping several things going without dropping any. Its shadow is the obvious one, the juggling cannot continue indefinitely, and the card sometimes marks a querent who has mistaken managing a problem for solving it.
It is a small card and an easy one to skim past in a spread. It is also, for anyone interested in where the tarot came from rather than what it means, the single most evidential card in the deck, because it is the one that tells you who printed it and when.