It's about half as big as a Post-it® Note (3M).
In other words, 0.00000260 dunams is 0.480 times the size of a Post-it® Note (3M), and the size of a Post-it® Note (3M) is 2.10 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.
It's about half as big as a Playing Card.
In other words, 0.00000260 dunams is 0.460 times the size of a Playing Card, and the size of a Playing Card is 2.20 times that amount.(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 0.00000560 dunams. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 0.00000260 dunams smaller.
It's about three-and-a-half times as big as a Secure Digital (SD) card.
It's about five-and-a-half times as big as a Quarter.
In other words, 0.00000260 dunams is 5.6250 times the size of a Quarter, and the size of a Quarter is 0.17780 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 seven times as big as a Postage Stamp.
In other words, the size of a Postage Stamp is 0.10 times 0.00000260 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 seven-and-a-half times as big as a Nickel.
In other words, 0.00000260 dunams is 7.3590 times the size of a Nickel, and the size of a Nickel is 0.13590 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 nine times as big as a Penny.
In other words, 0.00000260 dunams is 9.120 times the size of a Penny, and the size of a Penny is 0.110 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.