If you learn Japanese, you'll have to learn the different readings 「音読み」and「訓読み」of each kanji, and soon enough you are going to meet compound words, made of two or more kanjis that use neither the 音 or the 訓 reading, but instead create a new reading.

I found this other reading under the name of 熟字訓「じゅくじくん」

But the japanese people I talked to didn't call it this way. So, to the native japanese speaker out there, how do you call it and why does wikipedia call it a different way from you guys ?

Thanks in advance.