pairthra

is the rune denoting the sound p (voiceless bilabial stop) in the Elder Futhark runic alphabet, in the Anglo-Saxon rune poem  named peorð. It does not appear in the Younger Futhark. In the poem, it is glossed with the enigmatic:

peorð byþ symble plega and hlehter / wlancum [on middum], ðar wigan sittaþ / on beorsele bliþe ætsomne

"Peorð is a source of recreation and amusement to the great, where warriors sit blithely together in the banqueting-hall."