/pjɑːrn/
noun· region: north-noemic, rural· frequency: rare· first recorded: 1888
a small, unanswerable letter — written without expectation of reply, kept because the writing was the work.
from pjar (a folded piece of paper) with the diminutive -n. the rural sense narrows further: a pjarn is written, sealed, and either sent with no return address or kept in a drawer. the postmasters' ledgers from the 1890s record bundles of pjarns held under indefinite delivery.
"i wrote her a pjarn after the funeral; i did not post it. the writing did what the letter could not." — from a diary, 1962
"there is a drawer in this house entirely of pjarns. they smell of the years they were written, not of paper." — overheard, the basement
see also · to one unnamed letter to self unsent letter dictionary