It's about two-and-a-half times as heavy as a Billiard Ball
In other words, 0.90 pounds is 2.5043478260870 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.399305555555550 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.343750 pounds and 0.3750 pounds. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about two-and-a-half times as heavy as a Puck (Hockey)
In other words, 0.90 pounds is 2.5043478260870 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.399305555555550 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 0.343750 pounds and 0.3750 pounds. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about three times as heavy as a Baseball
In other words, 0.90 pounds is 2.8097560975610 times the weight of a Baseball, and the weight of a Baseball is 0.355902777777770 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.31250 pounds and 0.3281250 pounds. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about three times as heavy as a Battery (D)
In other words, 0.90 pounds is 3.02 times the weight of a Battery (D), and the weight of a Battery (D) is 0.3310 times that amount.(Alkaline)
A "D" size battery weighs 0.2980 pounds. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about three-tenths as heavy as a Human Brain
In other words, 0.90 pounds is 0.3020 times the weight of a Human Brain, and the weight of a Human Brain is 3.310 times that amount.(adult)
The average weight of an adult human brain is between 2.980 pounds. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.
It's about four-and-a-half times as heavy as a Deck of Cards
In other words, the weight of a Deck of Cards is 0.230 times 0.90 pounds.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.210 pounds. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 500 pounds.
It's about one-fifth as heavy as a Chihuahua
In other words, 0.90 pounds is 0.1810 times the weight of a Chihuahua, and the weight of a Chihuahua is 5.520 times that amount.(a.k.a. Chihuahue(o) (FCI standard)
The F&d&ration Cynologique Internationale (FCI) calls for Chihuahuas to weigh about 4.960 pounds. Relative to their body sizes, Chihuahuas have the largest brain size of any dog breed.