It's about the number of Countries in Africa.
(2016 figures) (sovereign states recognized by the UN only)
It's about one-and-one-tenth times the number of Teeth in a Great White Shark's Mouth.
In other words, the count of Teeth in a Great White Shark's Mouth is 0.910 times 55.(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about three-fourths the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 1.30 times 55.(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about three-fifths the number of Keys on a Piano.
In other words, 55 is 0.630 times the count of Keys on a Piano, and the count of Keys on a Piano is 1.60 times that amount.(Moden layout; A0 to C7)
It's about half the number of Wolves in Yellowstone National Park.
In other words, 55 is 0.5290 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 1.890 times that amount.(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
It's about two times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.50 times 55.(a.k.a. EU) (2016 figures)
There are 28 member countries in the European Union, the latest member of which is Croatia. The EU is largely urban, with sixteen cities having a population of one million or more, and 75% of the population living in an urban area.
It's about half the number of Elements on the Periodic Table.
In other words, 55 is 0.4660 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 2.150 times that amount.(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)