It's about as big as a Secure Digital (SD) card.
It's about one-and-two-thirds times as big as a Quarter.
In other words, 0.000000770 dunams is 1.6660 times the size of a Quarter, and the size of a Quarter is 0.60020 times that amount.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. Washington quarter, a.k.a. two bits)
The George Washington quarter, in circulation in various forms since 1932, has a diameter of 24.26 mm (0.955 in) and an area of 0.00000046220 dunams.
It's about two times as big as a Postage Stamp.
In other words, the size of a Postage Stamp is 0.50 times 0.000000770 dunams.(average; United States dimensions)
A typical postage stamp measures an average of 0.000000400 dunams. One of the most prized stamps among collectors is the US-issued "Inverted Jenny" stamp printed in 1918, which features an upside-down image of Curtiss JN-4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
It's about two times as big as a Nickel.
In other words, 0.000000770 dunams is 2.1790 times the size of a Nickel, and the size of a Nickel is 0.45890 times that amount.(United States five-cent coin) (a.k.a. Jefferson nickel)
The nickel, in its current design since 1938, has a diameter of 21.21 mm (0.835 in) and an area of 0.00000035330 dunams.
It's about two-and-a-half times as big as a Penny.
It's about three times as big as a Dime.
It's about one-tenth as big as a Post-it® Note (3M).
In other words, 0.000000770 dunams is 0.140 times the size of a Post-it® Note (3M), and the size of a Post-it® Note (3M) is 7.10 times that amount.(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.00000540 dunams in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Post-it® note attached to his front door.