mudeli osa, mis kujundab valuvormis õõnsuse (pesa) kärni toetamiseks; samuti kärni osa, mille ülesandeks on kärni positsioneerimine vormis või õõnsus/pesa kärni toetamiseks ja positsioneerimiseks vormis (vt kärn), projection attached to a pattern in order to form recesses in the mold at points where core is to be supported; also a projection on the core for it location in a mold or an impression in the mold for supporting and positioning the core (see: core)