David Sundman writes:

Washington's Superintendent of Finance, and Pollock's close friend and business partner, Robert Morris-himself a key financial backer of the Revolution-began theprocess by sifting through the countless ledgers sent to Congress by Pollock, who, per Dr. Cummins,"kept careful record of these amounts, noting both the Bills which he receivedand the supplies which he purchased."

It was with those ledgers that Oliver Pollock finally achieved his dream of providing America with an important, lasting contribution. Not the numbers, but the poor penmanshipthat accompanied them.

"Pollock...entered the abbreviation 'ps' by the figures for 'peso.' Because Pollock recorded these Spanish "dollars" or "pesos" as 'ps" and because he tended to runboth letters together, the resulting symbol resembled a '$,'" says Jim Woodrick, the Historic Preservation Division Director of the Mississippi Department of Archives andHistory.

That's it. Historians have analyzed the source of the $ symbol and have yet to find it written down prior to Pollock's use in his ledgers. His unintentional creation issupported by the fact that Robert Morris chose to adopt the symbol and by 1797 had it cast in type in Philadelphia as the official symbol for new nation's own currency.

To read the Newman paper, see:
America's Silver Dollars: Coinage of the Americas Conference Proceedings No. 9(https://nnp.wustl.edu/library/book/512704?page=16)

For other Oliver Pollock references on the Newman Portal, here are my search results:
https://nnp.wustl.edu/library/searchwithterms?searchterm=Oliver%20Pollock

To read earlier E-Sylum articles, see:
ARTICLE CREDITS OLIVER POLLOCK WITH CREATING DOLLAR SIGN (https://www.coinbooks.org/esylum_v18n48a15.html)
CAJORI ON THE ORIGIN OF THE DOLLAR SIGN (https://www.coinbooks.org/esylum_v19n18a18.html)

To read the Atlas Obscura article, see:
The Bankrupt Irishman Who Created the Dollar Sign by Accident(https://www.atlasobscura.com/articles/the-bankrupt-irishman-who-created-the-dollar-sign-by-accident)