Understandable names of the radicals I'm looking for names of radicals that are universally used and understandable. As far as I know, the official radical names, e.g. 水部 aren't really used. I know that, in this particular case, the name is 三點水. But how about other radicals?

For example, what is 厂 called? The official name is 厂部 hăn bù, but would people understand me if I said that? I know that 厂 is chăng in simplified Chinese, but what name would be understandable e.g. in Taiwan or Hong Kong? The traditional version of 厂 is 廠, which doesn't even have the same radical. This page calls it 偏廈, but it doesn't look like it's used in practice, is it? Or should I call it X字頭 or X字旁? But how exactly?

If found many different lists: one, two, three, four, but there are a lot of differences between them. Which one lists names of radicals that are really used? Even native Chinese speakers sometimes forget how to write some obscure character, so I assume there must be a simple way to say “you need to write it with the sloping roof radical”. And I guess there must be some standard naming that is used in schools...

I'm most interested in names that are used in Taiwan, but answers about other places are welcome as well.
厂, this radical has few frequently used characters and you might not find any good name of it in practice. 偏廈 is probably the best one. I call it 厓字頭 because it is the radical of 厓 (cliff, which has derivatives of 崖 and 涯).

I now go a little deeper on this radical.

This radical is actually a character of its own. Inherently it read hɔn in Cantonese and han in Mandarin. In the evolution of characters, it turns into 厈 and 岸. It originates from stone and rock, and extends to the rocky side of hills. Most of characters under 厂 radical follow the meaning of 厂, like 厚, 原, 厲. These are some other readings of 厂. You can look them up in some great dictionaries.

As you notice, 广 and 厂 is so similar and some characters under 广 mistakenly goes into 厂, for example, 廈, 廠, 廁, 廚. 广 is some simple house and you can imagine a wall on the left side and A-shaped root. Those characters in this radicals follows the meaning of house, say 廈, 廠, 廁, 廚, 府, 庫, 廊, 廬, 廟.  广 has its reading too. It is jim in Cantonese and yan in Mandarin. I call it 廣字頭 as it is the radical of 廣.

It is possible to make of some commonly known characters under a radical, like 厓字頭, 廣字頭. For characters under 艸, it is named 草花頭. They all just mean the "head" or "top" of one or two particular characters.

A little bit more. The simplification of 廣 to 广 and 廠 to 厂 causes too much confusion in the understanding of Chinese characters. It is not only the confusion with meaning described above. 黃 and 敞 indicates the pronunciation of 廣 and 廠, and now they are eradicated in simplified characters.