The "g" typically stands for Gloss . The number 60019 corresponds to a specific vocabulary index or sentence ID within the dataset's labeling system.
If your video is part of the continuous sign language subset, it might also be referenced in: g60019.mp4
What is (e.g., a person signing, a specific action)? The "g" typically stands for Gloss
Authors: Pu, J., Zhou, W., & Li, H. Published in: IEEE Transactions on Multimedia (2020) a person signing