deckle edge

noun

1. the irregular, untrimmed edge of handmade paper, often used for ornamental effect in fine books and stationery, now often produced artificially on machine-made paper.

noun

1. the rough edge of handmade paper, caused by pulp seeping between the mould and the deckle: often left as ornamentation in fine books and writing papers
2. a trimmed edge imitating this