Why oh why do they have to be three letter acronymns? I’m sure it’s fine if you’re immersed in front-end web development and have memorised the nuances of each

Why oh why do they have to be three letter acronymns? I’m sure it’s fine if you’re immersed in front-end web development and have memorised the nuances of each unit, but as a back-end developer with a good working knowledge of CSS but for whom it isn’t my focus, I just know I’m going to have to constantly look these up every time I come across them.