The Soyombo proposal is beautiful, but it is missing a very important character in my opinion: http://www.unicode.org/L2/L2015/15004-soyombo.pdf
Encoding an empty letter frame will allow for its proper description in plain text (as it is clear in the proposal itself), it could be used as an stylized cursor in text processors and also we could make zwj sequences such that combining with consonants makes it only render the nucleus.
