: The " 01 " indicates this is Episode 1 of the series.
: Some fan-made or specific promotional animated versions. Team Blue Lock : Content related to the "Blue Lock" series. The Band Lab : Music-related anime performances. gateanime-com-tbl-01-1080fhd-mp4
: It could also be a shorthand for a "Boys' Love" genre series. : The " 01 " indicates this is Episode 1 of the series