It's about 1,000 times as big as a Ballpoint Pen Tip.
In other words, 0.000000770 dunams is 1,100 times the size of a Ballpoint Pen Tip, and the size of a Ballpoint Pen Tip is 0.00091 times that amount.(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen â€” a medium-tip â€” measures 0.000000000700 dunams. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about ten times as big as a Nailhead.
In other words, 0.000000770 dunams is 9.9050 times the size of a Nailhead, and the size of a Nailhead is 0.1010 times that amount.(for 11-gauge wire nai)
An 11-gauge nailhead measures 0.000000077740 dunams. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about three times as big as a Dime.
It's about two-and-a-half times as big as a Penny.
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 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 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.