What are tensile meridian and compressive meridian? And how are uniaxial tension and biaxial compression related?

Ive added two screenshots which I think are related, but I cant make sense of it. ​ \"Examples of stress states on the tensile meridian are uniaxial tension and biaxial compression. On the compressive meridian stress states such as uniaxial compression and biaxial tension resides.\" ​ https://preview.redd.it/qa9e9k1ti2i41.png?width=1073&format=png&auto=webp&s=c224c4013b81c91df371815fb2af14372239f799 submitted by /u/santalos5 [link] [comments]

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