acetylides

https://doi.org/10.1351/goldbook.A00067
Compounds arising by replacement of one or both hydrogen atoms of acetylene (ethyne) by a metal or other cationic group. E.g. NaC≡CH monosodium acetylide. By extension, analogous compounds derived from terminal acetylenes, RC≡CH.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1311 (https://doi.org/10.1351/pac199567081307)