any substance used to provide cooling (as in a refrigerator)
(refrigeration) the process of cooling or freezing (e.g., food) for preservative purposes
A substance used for refrigeration
causing cooling or freezing; "a refrigerant substance such as ice or solid carbon dioxide"
Arithmetic
A quantity or amount
the property possessed by a sum or total or indefinite quantity of units or individuals; "he had a number of chores to do"; "the number of parameters is small"; "the figure was about a thousand"
a concept of quantity involving zero and units; "every number has a unique position in the sequence"
An arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification
total: add up in number or quantity; "The bills amounted to $2,000"; "The bill came to $2,000"
Dangerous Refrigerant
This one seems to be quite rare. This is toxic refrigerant exploding under pressure all over the poor stick figure. This sign was on an air conditioning unit.