NS5-brane ($T_{NS5}=\frac{1}{(2\pi {)}^5{g}_s^2{\alpha }^{\prime 3}}$)

An NS5-brane, or Neveu-Schwarz five-brane, is a type of extended object in string theory. Branes, which are short for "membranes," can exist in various dimensions, and they play a crucial role in the framework of string theory, particularly in understanding non-perturbative aspects of the theory.