notation – Chinese character as a mathematical symbol

Titchmarsh mentioned on p.25 of Mathematics for the general reader (1959) who

Some types of algebra are so complicated that they use the entire alphabet, uppercase and lowercase letters, as well as the Greek alphabet. A few years ago, a mathematical article was published in which a Chinese character was used as one of the algebraic symbols.

Does anyone know what Titchmarsh paper was probably talking about? (I assume of course that the document was written in a European language rather than in Chinese.)