Definition from Wiktionary, the free dictionary
See also 立
From ㅂ (b) + additional horizontal line representing burst of aspiration.
- 피읖 (pieup), a jamo (letter) of the alphabet of the Korean writing system, hangeul; the aspirated bilabial plosive (IPA: [pʰ])
Usage notes 
In the North Korean order, ㅍ (p) is the thirteenth jamo. In the South Korean order, it is the eighteenth.