Percina tanasi, a freshwater fish of the perch family, found in East Tennessee, United States.

(computing theory) The set of such problems.

(politics) Synonym of vote of no confidence / (politics, informal) A regular motion that serves as an informal indicator of confidence in the current leader or government.

Arundo donax, usually called giant reed, of the Mediterranean and vicinity. / Arundinaria gigantea (rivercane), of the southeastern US.