- any nonflowering plant of the genus Equisetum, having hollow, jointed stems.
- a horse's tail formerly used as a Turkish military standard or as an ensign of a pasha, the number of tails increasing with the rank.
- a ponytail.
- any tracheophyte plant of the genus Equisetum, having jointed stems with whorls of small dark toothlike leaves and producing spores within conelike structures at the tips of the stems: phylum Sphenophyta
- a stylized horse's tail formerly used as the emblem of a pasha, the number of tails increasing with rank
