It's about as big as a Post-it® Note (3M)
(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 as big as a Playing Card
It's about seven times as big as a Secure Digital (SD) card
It's about one-tenth as big as an Apple iPad
In other words, 0.00000540 dunams is 0.13490 times the size of an Apple iPad, and the size of an Apple iPad is 7.4130 times that amount.(for 9.7 inch, Apple iPad Air MD785LL/B)
An Apple iPad measures 23 cm (9.4 in) x 17 cm (6.6 in) for a total device area of 0.000040020 dunams. The base model iPad Air features 16 GB of storage capacity.
It's about ten times as big as a Postage Stamp
In other words, the size of a Postage Stamp is 0.10 times 0.00000540 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 eleven-and-a-half times as big as a Quarter
In other words, 0.00000540 dunams is 11.680 times the size of a Quarter, and the size of a Quarter is 0.08562 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 fifteen-and-a-half times as big as a Nickel
In other words, 0.00000540 dunams is 15.280 times the size of a Nickel, and the size of a Nickel is 0.06545 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.