Bootstrapped distribution of projected rotational velocities for O-type stars across different regions within the local Universe. The histograms in black, green, purple, and brown show the v sin i measurements for Galactic stars in the solar neighborhood (Holgado et al. 2022), 30 Doradus (Ramírez-Agudelo et al. 2013), Carina OB1 (Berlanas et al. 2025), and NGC 346 (Dufton et al. 2019), respectively. The orange histogram represents the rotational velocity distribution for Cygnus OB2, incorporating O-type stars from Berlanas et al. (2020) alongside those recently reclassified from the B0 sample. The error bars reflect the standard deviation in each velocity bin obtained from the bootstrap analysis.