(architecture) One of many decorative boards that form a valance for a canopy, particularly on older railway stations.
2024 May 29, Tony Streeter, “Network News: Railway Children charity partners with Rail Live 2024”, in RAIL, number 1010, page 19:
It will also have examples of its composite canopy daggerboards, which use CNC technology to produce replicas of historic designs - and which have been deployed as modern alternatives to traditional daggerboards in sensitive surroundings such as at Bath Spa.