It's about as big as a Nailhead
It's about three-tenths as big as a Dime
It's about one-fourth as big as a Penny
In other words, 0.000000077740 dunams is 0.2730 times the size of a Penny, and the size of a Penny is 3.660 times that amount.(United States one-cent coin) (a.k.a. Lincoln penny, a.k.a. Cent, a.k.a. One cent piece)
The Lincoln penny, in its current design since 1909, has a diameter of 19.05 mm (0.75 in) and an area of 0.0000002850 dunams.
It's about one-fifth as big as a Nickel
In other words, 0.000000077740 dunams is 0.220 times the size of a Nickel, and the size of a Nickel is 4.5450 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 one-fifth as big as a Postage Stamp
In other words, the size of a Postage Stamp is 5 times 0.000000077740 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 one-fifth as big as a Quarter
In other words, 0.000000077740 dunams is 0.16820 times the size of a Quarter, and the size of a Quarter is 5.9450 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 one-tenth as big as a Secure Digital (SD) card