Wooden clapper, kołatka, used as an alternative to a musical instrument during Lent. It is T-shaped, with two wooden beaters attached to the top. These are hinged, so that they produce a rattling noise when the clapper is shaken.
used as percussion during processions in Lent, when musical instruments are not allowed, especially at 'Half Lent' ceremony. Boys can use these in church on Good Friday while people pray.