2026-09-28T21:10:26+01:00https://marinefinds.org.uk/datalabs/terminology/object/format/jsonhttps://marinefinds.org.uk/datalabs/terminology/object/format/xmlhttps://marinefinds.org.uk/datalabs/terminology/object10441140273SIGNAL SQUAREYA signalling structure used on WWII airfields, comprising a concrete square base with a kerbed border into which concrete signal symbols could be placed to advise pilots in the air of current airfield state e.g. directions of landing and airfield circuit.1P