Distribution of projected rotational velocities for O-type stars v sin i across different regions of the local Universe. The histograms in black, green, purple, and brown represent 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 displays the rotational velocity distribution for Cygnus OB2, integrating O-type stars from Berlanas et al. (2020) with those newly identified in our reclassification of the B0 sample.