Latin ch digraph
Ch is a digraph in the Latin script. It is treated as a letter of its own in the Chamorro, Old Spanish, Czech, Slovak, Igbo, Uzbek, Quechua, Ladin, Guarani, Welsh, Cornish, Breton, Ukrainian Latynka, and Belarusian Łacinka alphabets. Formerly, ch was also considered a separate letter for collation purposes in Modern Spanish, Vietnamese, and sometimes in Polish; now the digraph ch in these languages continues to be used, but it is considered as a sequence of letters and sorted as such.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).