This character is a Other Letter and is mainly used in the Egyptian Hieroglyphs script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+13053 forms with similar adjacent characters prevents a line break inside it.
The Unikemet database provides additional information about this hieroglyph. It is described there as βWoman, pregnant, seated, both knees down, right arm forward, angling down towards the knee, left arm hanging beside the body, with 3 vertical lines coming from the legs.β.
The Wikipedia has the following information about this codepoint:
The total number of distinct Egyptian hieroglyphs increased over time from several hundred in the Middle Kingdom to several thousand during the Ptolemaic Kingdom.
In 1928/1929 Alan Gardiner published an overview of hieroglyphs, Gardiner's sign list, the basic modern standard. It describes 763 signs in 26 categories (AβZ, roughly). Georg MΓΆller compiled more extensive lists, organized by historical epoch (published posthumously in 1927 and 1936).
In Unicode, the block Egyptian Hieroglyphs (2009) includes 1071 signs, organization based on Gardiner's list. As of 2016, there is a proposal by Michael Everson to extend the Unicode standard to comprise MΓΆller's list.
Woman, pregnant, seated, both knees down, right arm forward, angling down towards the knee, left arm hanging beside the body, with 3 vertical lines coming from the legs.