SECS

SECS contains 708 characters.

colorcode: {{legend|#FFFF88|not in WGL4}} {{legend|#FFDDCC|not in WGL4 or MES-2}}

Source: https://www.cl.cam.ac.uk/~mgk25/ucs/secs.html

IPA extension
colorcode: {{legend|#FAFAFA|IPA-MINI characters already in SECS}} {{legend|#FFFF88|IPA-MINI characters not in SECS}}