Etymology: This character was once a pictograph of a wooden musical instrument. How this extended to mean profession is not clear.
Some say that the character also resembled classroom tablets (mini-chalkboards), which lead the meaning to be associated with teaching and hence, profession.
Another theory is that the character represents something of great complexity, thus requiring much study to master.
Mnemonic: STUDY COMPLEX WOODEN INSTRUMENT AS PROFESSION.
(Based upon Henshall, 1998)