The proteinaceous structure at the distal tip of the bacterial-type flagellar filament. [ GOC:cilia http://www.ncbi.nlm.nih.gov/pubmed/12624192 GOC:mtg_sensu http://www.ncbi.nlm.nih.gov/pubmed/10572114 ]
Synonyms: flagellar filament cap flagellin-based flagellum filament cap