elpa-spinner 1.7.4-2 (armhf binary) in ubuntu lunar

 This library provides functions to add spinners to the Emacs
 modeline. Spinners are used to indicate that an operation is in
 progress.
 .
 A spinner is a column or columns of the modeline where the character
 displayed in that column or columns changes rapidly, looping through
 a sequence of characters or strings, until the operation is
 complete. For example, one spinner type provided by this package
 loops through these four characters: ◰, ◳, ◲ and ◱.