Pictogram (象形): looks like a bird flying upwards.
In modern form, resembles a tasseled 升 (shēng).
Etymology
Area word:
Proto-Sino-Tibetan *bjar ~ *p(i/u)r (“to fly”) > Tibetan འཕུར་བ ('phur ba),
Proto-Mon-Khmer *par (“to fly”) > Old Mon ပဝ် (pɔ); Proto-Vietic *pər (“to fly”) (> Vietnamese bay).
Cognate with 翂 (OC *pɯn, “appearance of birds flying slowly”),