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, 190 nanoacres is 1.664 times the size of a Quarter, and the size of a Quarter is 0.601 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 114.20 nanoacres.
It's about two times as big as a Postage Stamp
In other words, 190 nanoacres is 2 times the size of a Postage Stamp, and the size of a Postage Stamp is 0.5 times that amount.(average; United States dimensions)
A typical postage stamp measures an average of 100 nanoacres. 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
It's about two-and-a-half times as big as a Penny
In other words, 190 nanoacres is 2.7 times the size of a Penny, and the size of a Penny is 0.37 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 70.40 nanoacres.
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, 190 nanoacres is 0.14 times the size of a Post-it® Note (3M), and the size of a Post-it® Note (3M) is 7.1 times that amount.(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 1,300 nanoacres 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.