Dragon's teeth

Dragon's teeth or dragon's tooth first appeared in Greek mythology; once planted, each tooth grew into a fully armed warrior. This gave rise to the phrase "to sow dragon's teeth," used as a metaphor to refer to doing something that has the effect of fomenting disputes.

Later uses of the term are:

Military engineering

Dragon's teeth (fortification), anti-tank obstacles

Books

Dragon's Teeth: A Novel, an 1878 realist novel
The Dragon's Teeth, a 1939 mystery novel
Dragon's Teeth (novel), a 1942 Pulitzer Prize-winning historical novel by Upton Sinclair
Dragon's teeth: the background, contents and consequences of the North Atlantic Pact, 1949 non-fiction book by Konni Zilliacus
"Dragons' Teeth" (short story), a 1977 fantasy short story
The Dragon's Teeth?, a 1982 American book
The Dragon's Tooth, a 2011 fantasy novel
Dragon's Teeth, a fantasy novel by James A. Hetley (sequel to "Dragon's Eye")
Dragon's Teeth Mountains, a fictional mountain range in the Shannara series of books
Dragon Teeth, an upcoming posthumous novel by late Michael Crichton (to be published in May 2017)

Other literature and media

"The Dragon's Teeth" (radio), a 1941 radio story
"Dragon's Teeth" (Star Trek: Voyager), a 1999 television episode
Dragon's Tooth, a fictional sniper rifle in the Fafner in the Azure anime series
Dragon's Tooth (video game), a 1986 British video game

Botany

Dragon's teeth (plant), a plant species in the genus Lotus

Traffic engineering

Dragon's Teeth (traffic), a series of calibrated lines painted on a road surface to enforce a speed limit

Geography

Dragons Teeth (Antarctica), a small group of rocks in Antarctica
Dragon's Teeth Gate, a craggy granite outcrop in Singapore
Dragon's Tooth (Virginia), a trail landmark in Virginia