Mathcore (also known as technical metalcore, technical hardcore and progressive metalcore) is a polyrhythmic and dissonant style of metalcore, recognized for a high level of technical musicianship. Mathcore has its roots in bands like Converge, Botch, and the Dillinger Escape Plan. The term mathcore is suggested by analogy with math rock. Both math rock and mathcore make use of polyrhythms and unusual time signatures. Math rock groups (Slint, Don Caballero, Shellac, Drive Like Jehu) have some influence on mathcore, though mathcore is more closely related to extreme metal. For this reason, the term is misleading; math rock actually draws on traditional hardcore punk to a greater degree than mathcore does. Mathcore is also linked to post-metal, in much the same way that math rock opened the gates for post-rock.