The use of stationary exercise bicycles in a group is usually referred to as Spinning.
a turntable
stationary clot is called a thrombus or a blood clot.
Track cycling is done in a velodrome.
Parallax
As with so many words, this comes to us because we prefer a shorter word to a longer. "Cycling" is a shortened version of "bicycling".
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Cycling
Origin
A stationary object used to gauge the movement of another object might be called the reference. This could also be termed as the point of reference.
Performances are Typically called recitals. One Competition is called Feis. Many Competitions are called Feisanna. A group Dance is called a Ceili.
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A person who sells pencils and inkpots is called a stationery vendor or a stationary supply retailer.