twirl

Concise Oxford English Dictionary © 2008 Oxford University Press:
twirl/twɜːl/

▶verb spin quickly and lightly round. ▶noun an act of twirling.

■ a spiralling or swirling shape, especially a flourish made with a pen.

– derivatives
twirler noun,
twirly adjective .

– origin C16: prob. an alt. (by assoc. with whirl) of tirl, a var. of archaic trill ‘twiddle, spin’.