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"Pi" is the symbol almost always used to represent the ratioof the circumference of any circle to its diameter.
The ratio of (distance) / (time), called "speed".The ratio of (speed) / (time), called "acceleration".The ratio of (force) / (area), called "pressure".The ratio of (force) / (acceleration), called "mass".The ratio of (mass) / (volume), called "density".The ratio of (distance) / (volume), sometimes called "fuel economy".The ratio of ( 1 ) / (time), called "frequency".The ratio of (energy) / (time), called "power".
A colon is used between the number of a ratio. (A colon is also used to separate the digits of a sexagesimal (base 60) number used to represent seconds (or minutes) since midnight, ie the time of day.)
Percentage!
the numbers in a ratio called TERMS