I have started practicing Japanese again using Duolingo and some other resources. Reading about katakana I discovered that there are two systems of ordering it: the modern gojūon and the old-fashioned iroha.
The interesting bit is that Iroha is a poem famous for being a perfect pangram and containts each letter of the Japanese syllabary.
It is still quite present in daily life to the point that イロハ is comparable to the English expression “the ABCs”.
I could extend more, but it is better to visit the Wikipedia article about it.