As defined by the Cleasby & Vigfusson Old Norse to English dictionary:
- f. argilla apyra, also called Pétrs mold, argilla St. Petri, Eggert Itin. p. 125.
Possible runic inscription in Younger Futhark:ᛒᛅᚱᚾᛅ-ᛘᚢᛚᛏ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements
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Works & Authors cited:
- Itinerarium or Travels of Eggert Ólafsson, 1772.