Flag for Nablus (PS-NBS)

The 🏴󠁰󠁳󠁮󠁢󠁳󠁿 emote represents the flag of Wales, which features a red dragon on a green and white background. The "PS-NBS" in the Flag for Nablus (PS-NBS) emote likely refers to Palestine, as Nablus is a city in the West Bank. However, I could not find any information about an official flag for Nablus or the significance of this particular emote.