2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53697We review various aspects of a fermionic gauge symmetry, known as the $κ$--symmetry, which plays an important role in formulations of superstrings, supermembranes and higher dimensional extended objects. We also review some aspects of the connection between $κ$--symmetric theories and their twistor-like formulations.21 pages, plain tex, CTP TAMU-28/93. (Based on a talk given at the Salamfest, Trieste, March 1993)High Energy Physics - Theorytext