Zimbabwe, 2008 AD., Reserve Bank of Zimbabwe, 100.000.000.000.000 Dollars, Pick 91. AA4748003 Reverse

State: Zimbabwe
Issuer: Reserve Bank of Zimbabwe
Location of issue: Harare
Date of issue: 2008 AD.,
Value: 100.000.000.000.000 Zimbabwean Dollars
Size: 147 x 72 mm
Material: paper
Watermark: -
Serial :
Serial no. : AA4748003 (All 100 Trillion notes have AA serial numbers.)
Signature: Dr. G. Gono , governor (1)
Printer: Fidelity Printers and Refiners Harare, (Zimbabwe)
Obv.: 100 000 000 000 000 - RESERVE BANK OF ZIMBABWE – 100 000 000 000 000 / I promise to pay / the bearer on demand / ONE HUNDRED / TRILLION / DOLLARS …. , Chiremba balancing rock formation at center, blue cow above Zimbabwe soapstone bird to right on blue field, blue and pink ornaments.
Rev.: 100 000 000 000 000 - RESERVE BANK OF ZIMBABWE - 100 000 000 000 000 / 100 000 000 000 000 , Victoria Falls at left, buffalo at r., blue and pink ornaments around, blue cow to left on white and blue field.
References: World Paper Money P-91 .

First introduced in 2009, the Zimbabwe 100 Trillion Dollar note was worth roughly $30 U.S. dollars at the time of its release into the economic wild. It was part of a long line of monetary measures to help the floundering economy of Zimbabwe deal with the rapidly-hyperinflation collapse that it was experiencing. Prices would often double from one day to the next, and precious commodities such as food and fuel were in short supply for people who did not have access to U.S. dollars.

While a couple other banknotes from other countries have reached the 100 Trillion level, notably the Hungarian pengő following World War Two, for which there were plans to release a 1 Sextillion pengő note, the Zimbabwe 100 trillion note has more zeros actually printed on it than any other banknote.
Released in 2008, just months before Zimbabwe abandoned their currency,

In August 2008 Zimbabwe has revalued its currency for the second time by removing 10 zeros. June 12, 2015 · What can you buy for $100 trillion in Zimbabwe? As of Monday, the government is officially phasing out the country's entire currency and Zimbabweans will start exchanging “quadrillions” of local dollars for US dollars. As part of a “demonetization” program, Zimbabwe's central bank plans to remove the 100-million dollar, 100-trillion dollar and other bank notes from circulation.
Zimbabwe will rely on the US dollar for purchases
And what will Zimbabweans get for their cash? For every 175 quadrillion Zimbabwe dollars, locals will get $5 in exchange. So, 250 trillion Zimbabwe dollars will be worth just $1.
Ending a country’s currency seems pretty drastic. But this is really, in a sense, ratifying what’s been happening since 2009, according to Dr. Knox Chitiyo, an associate professor at the London think tank Chatham House and also a Zimbabwean.
"That’s when we went to a basket of various currencies, primarily US dollars and South African rand. So this is really ratifying what’s been happening," Chitiyo says.
lthough people have primarily been using the US dollar for years, many have been holding on to their Zimbabwean dollars, partly because there has been uncertainty as to whether or when there might be a return to the Zimbabwean dollar.
Chitiyo says one big reason for the Central Bank's move is to reassure people that the Zimbabwean dollar is not about to return any time soon.
So how have ordinary Zimbabwean's been coping with managing multiple currencies in their daily lives?
"One thing we could say, perhaps half in jest, Zimbabweans in a way are probably the best accountants in the world," Chitiyo says. "What happened with our economic crisis since 2000, is people really became extremely adept at coping with multiple economic challenges."

More on https://en.wikipedia.org/wiki/Zimbabwean_dollar , https://en.wikipedia.org/wiki/Banknotes_of_Zimbabwe#Paper_money_of_the_fourth_dollar_(ZWL)