feather

Notice, too, that the shaft is not straight, but bent so that the upper surface of the feather is convex, and the lower concave.

I am not of that feather to shake off / My friend when he must need me.

To some pew purchasers he gave deeds, to others he gave, none, but both were promised security, and both it seems were equally secure, for the pew deed as Mr. Melledge declared to Mr. G. was not worth a feather.

Signal M123 is a conventional 3-aspect colour light with three Junction Indicators - commonly known as 'feathers'.