His pen name represented the transposition of his initials and his middle name.
他的筆名是他姓名首字母與中名順序的颠倒。
3VERB 使(樂曲)變調 If you transpose a piece of music, you perform it or write it in a musical key which is different from the original one. 使(樂曲)變調 [technical] [Also VERB n]
She could play any piece of music she heard and transpose it into any key. [VERB noun into noun]