If this is the specific release with 10-bit color depth (which is common for x265), the full title is likely:

: Stands for "Web Download," meaning the file was losslessy ripped directly from a streaming service like Netflix, Amazon, or iTunes.

The screen didn't just show a battle; it showed a horizon. And in that extra space at the edge of the frame, the user saw the one thing the Council feared most: a way out.

: This indicates a high-definition source (1920x1080 resolution) captured directly from a digital streaming service rather than a physical disc.

You see more of the sky, more of the ground, and more of the massive Persian armies. The cliffside battle at the Hot Gates gains a new sense of vertical grandeur.