What is the difference between spiral, flame, aggregation data
Generally, without knowing the source of the data, we can't tell you much about the columns. But I assume the first two columns correspond to $x$ and $y$. The third is probably some meta-data? Maybe a cluster number?
For an illustration I found this figure coming from this publication. Maybe that helps you imagine the data's shape.
https://www.researchgate.net/publication/338167806_A_Fast_Method_for_Estimating_the_Number_of_Clusters_Based_on_Score_and_the_Minimum_Distance_of_the_Center_Point