1) Particle 
[fireworks] A superstring, also known as a cracker wall, is a name commonly given to an immense bundle of firecrackers, usually numbering in the hundreds of thousands, which are often a central fixture at fireworks conventions. Although large compound strings of firecrackers have been constructed since firecrackers were invented, the supers...
[n] - a hypothetical particle that is the elementary particle in a theory of space-time
noun a hypothetical particle that is the elementary particle in a theory of space-time
an elementary particle treated as a string in any string theory of supersymmetry.