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+1309D 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 βA forearm, with the palm of the hand facing upwards.β.
The Wikipedia has the following information about this codepoint:
As used for Egyptology, transliteration of Ancient Egyptian is the process of converting (or mapping) texts written as Egyptian language symbols to alphabetic symbols representing uniliteral hieroglyphs or their hieratic and demotic counterparts. This process facilitates the publication of texts where the inclusion of photographs or drawings of an actual Egyptian document is impractical.
Transliteration is not the same as transcription. Transliteration is the representation of written symbols in a consistent way in a different writing system, while transcription indicates the pronunciation of a text. For the case of Ancient Egyptian, precise details of the phonology are not known completely. Transcription systems for Ancient Egyptian do exist, but they rely on linguistic reconstruction (depending on evidence from the Coptic language and other details) and are thus theoretical in nature. Egyptologists rely on transliteration in scientific publications.