4 relations: Frequency, Orion variable, Slow irregular variable, Variable star.
Frequency
Frequency is the number of occurrences of a repeating event per unit of time.
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Orion variable
An Orion variable is a variable star which exhibits irregular and eruptive variations in its luminosity and is typically associated with diffuse nebulae.
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Slow irregular variable
A slow irregular variable (ascribed the GCVS types L, LB and LC) is a variable star that exhibit no or very poorly defined periodicity in their slowly changing light emissions.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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