While the industry standard for premium content has moved toward 4K, 540p (960 x 540) remains a "sweet spot" for high-volume networks.
It sounds like you're referring to a specific video or file name — possibly a CS:GO or VALORANT clip or demo review labeled "deep analysis team skeet 2023 540p split sc."
This suffix typically refers to "Scene," "Screener," or a specific encoding group's tag, indicating the source and version of the file. 2. Trends in 2023 Digital Media