No specific information is given about Rei's origin or heritage. Ritsuko Akagi states that Rei was born in a certain room deep in the lower levels of NERV headquarters, but this is all that is explicitly revealed in the series about her creation. The Red Cross Book stated that Rei was created from the "salvaged remains" of Yui Ikari after Yui's absorption into Unit-01 in 2004.

Fully embroidered patch with iron on backing.
Approximately 2.5 x 3.5 "