seal
n//siːl//säl, sigill
A pinniped (Pinnipedia), particularly an earless seal (true seal) or eared seal.
A stamp used to impress a design on a soft substance such as wax.
A facsimile of an impression of such stamp that is a mark or symbol of an office or organisation.
Something which will be visibly damaged if a covering or container is opened, and which may or may not bear an official design.
A tight closure, secure against leakage.