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I'm wondering if the names Guil is using are industry standard. Being new to this, I don't see these names as being descriptive and wouldn't understand what they mean just by looking at it.
In these videos Guil uses names such as %hdln-prim for primary headline or $hdln-sec for secondary headline. In an earlier video p-el was used for a pseudo element mixin. Reading p-el one could very easily think the p is for a paragraph element.
Are these standard naming conventions? Are these names part of BEM? Is there a website that someone could point me that indicates a glossary of the short-form names?