Here is the list of scales starting with the letter P.
*Palamidian: 1 2 1 2 2 2
*Pelog: 1 2 3 1 1 2
*Pentatonic Major: 2 2 3 2
*Pentatonic Minor: 3 2 2 3
*Persian: 1 3 1 1 2 3
*Pharptian: 3 2 2 2 1 1
*Pharptian Oct: 3 1 1 2 2 1 1
*Phrygian: 1 2 2 2 1 2
*Phrygian n2: 2 1 2 2 1 2
*Phrygian n2 n6: 2 1 2 2 2 1
*Phrygian n3: 1 3 1 2 1 2
*Phrygian #4: 1 2 3 1 1 2
*Phrygian b4: 1 2 1 3 1 2
*Phrygian b5: 1 2 2 1 2 2
*Phrygian n6: 1 2 2 2 2 1
*Phrygian Dominant: 1 3 1 2 1 2
*Phrytatonic: 3 2 3 2
*Phylian Oct: 1 1 3 2 2 2
*Phylian Oct: 1 1 3 1 1 2 2
*Piongio: 2 3 2 2 1
*Polymode Major: 2 1 2 1 2 2 1
*Polymode Minor: 1 1 2 1 2 1 2
*Pontikonisian: 1 2 2 1 2 1
*Promtheus: 2 2 2 3 1