What are characters called when they have three of the same radical used?

Question

I sometimes encounter characters like 鑫, which is made of three 金 radicals, or 龘, which is made of three 龍 radicals. What are they called and is there a reason for their existence? Ive tried looking online but havent found a good resource yet.

Answer 1

maybe, called “三疊字”, have a look of this page

10個少見「三疊字」 你識唔識讀？

btw, the wiki page:

https://zh.wikipedia.org/zh-hk/三叠字

have fun :)

edited.

i checked a book in literary chinese, it was called “三字”. a famous (imo, only) story: three literati composed verses using “三字”, while drinking alcohol 🙀

陳詢出為同知，同僚餞之。令各用三字分合，以韻相協，以成句終之。

陳循云：「轟字三個車，余斗字成斜。車、車、車，遠上寒山石徑斜。」

高轂云：「品字三個口，水酉字成酒。口、口、口，勸君更盡一杯酒。」

詢自云：「矗字三個直，黑出字成黜。直、直、直，焉往而不三黜。」

簷曝雜記 volume 5, page 92