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Here, we compare well-known and reliable optical diagrams sensitive to the main ionization source (i.e., star formation, SF; active galactic nuclei, AGN; and shocks) to UV counterparts proposed in the literature\u2014the so-called \u201cUV\u2013BPT diagrams\u201d\u2014using the HST COS Legacy Archive Spectroscopic SurveY (CLASSY), which is the largest high-quality, high-resolution, and broad-wavelength range atlas of far-UV spectra for 45 local star-forming galaxies. In particular, we explore where CLASSY UV line ratios are located in the different UV diagnostic plots, taking into account state-of-the-art photoionization and shock models, and, for the first time, the measured ISM and stellar properties (e.g., gas-phase metallicity, ionization parameter, carbon abundance, and stellar age). We find that the combination of C <jats:sc>iii<\/jats:sc>] <jats:italic>\u03bb<\/jats:italic>\n                  <jats:italic>\u03bb<\/jats:italic>1907,9 He <jats:sc>ii<\/jats:sc>\n                  <jats:italic>\u03bb<\/jats:italic>1640 and O <jats:sc>iii<\/jats:sc>] <jats:italic>\u03bb<\/jats:italic>1666 can be a powerful tool to separate between SF, shocks, and AGN at subsolar metallicities. We also confirm that alternative diagrams without O <jats:sc>iii<\/jats:sc>] <jats:italic>\u03bb<\/jats:italic>1666 still allow us to define an SF-locus, with some caveats. Diagrams including C <jats:sc>iv<\/jats:sc>\n                  <jats:italic>\u03bb<\/jats:italic>\n                  <jats:italic>\u03bb<\/jats:italic>1548,51 should be taken with caution given the complexity of this doublet profile. Finally, we present a discussion detailing the ISM conditions required to detect UV emission lines, visible only in low gas-phase metallicity (12 + log(O\/H) \u2272 8.3) and high ionization parameter (log(<jats:italic>U<\/jats:italic>) \u2273 \u22122.5) environments. Overall, CLASSY and our UV toolkit will be crucial in interpreting the spectra of the earliest galaxies that JWST is currently revealing.<\/jats:p>","DOI":"10.3847\/1538-4357\/ad1033","type":"journal-article","created":{"date-parts":[[2024,2,9]],"date-time":"2024-02-09T14:36:56Z","timestamp":1707489416000},"page":"95","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":32,"title":["CLASSY. VIII. 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