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Yes, the noun 'squadron' is a collective noun for:
squadron Flotilla, Squadron......
The noun 'squadron' is a singular, common, concrete noun; a word for a military group; a word for a thing.
The noun 'squadron' is a standard collective noun for:
A bar sinister is a non-standard term in heraldry for a bend sinister or baton sinister, found on a coat of arms.
6 Squadron RAF Leuchars3 Squadron RAF Coningsby17 Squadron RAF Coningsby29 Squadron RAF Coningsby11 Squadron RAF Coningsby