XmStringComponentType(3) on Linux
The text 4a5ccd72ff81, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Data type for compound string components "XmStringComponentType" "data types" "XmStringComponentType"