Al Khamsa, Inc - is a not-for-profit organization devoted to the preservation
of the horse of Bedouin Arabia, as recognized by Al Khamsa, through education
and research in a non-competitive social climate which draws admirers of such
horses together with the interest of fitting the Bedouin horse into Western life. 
Their work is to study, document, research, and find out as much as we can
about the Arabian horse of Bedouin origin as it exists today, or as its descendants
exist today in the United States, and then share this information with others... 
Source - Al Khamsa Arabians II, 1994 (click HERE to visit the Al Khamsa website)

Al Khamsa Arabian - refers to those horses in North America that can
reasonably assumed to descend entirely from Bedouin Arabian horses bred by the
horse-breeding Bedouin tribes of the deserts of the Arabian peninsula, without
admixture of horses unacceptable to Al Khamsa. Al Khamsa, Inc, reserves the
right to determine which horses are called Al Khamsa Arabian Horses. Source -
Al Khamsa bylaws (amended 9/93)

Al Khamsa Foundation Horse - Al Khamsa is a closed gene pool, tracing
descent exclusively from a defined set of documented Foundation horses classified
by their ancestral elements. For more details about Ancestral Elements, visit the
Al Khamsa, Inc. FAQ pages. The web address is www.alkhamsa.org/ancelements.html

Abbas Pasha - Abbas Pasha I ruled Egypt as Viceroy from 1848-1845, and
amassed the greatest herd of Desert Arabians in the modern world, acquired
through purchase, gift, trade, and inheritance from his uncle and grandfather. 
His agents authenticated this herd by documenting their pedigrees and histories. 
Scribes recorded the histories of the Abbas Pasha herd in great detail, translated
in part by Lady Anne Blunt, and later in full by Gulsun Sherif and Judith Forbis.

Extant - In existence. A line that is no longer "extant" is extinct. Many
Heirloom horses that are no longer extant within the Heirloom herd proper still
survive within the Heirloom/El Deree variant.

Heirloom - Horses classified as Heirloom carry only the Egypt I and Blunt Al
Khamsa ancestral elements. The Heirloom Eqyptian Arabian herd derives
exclusively from taproot horses defined as those Al Khamsa Foundation Horses
exported from Arabia Deserta before 1914, from which the Root Mares and Root
Stallions of the Royal Agricultural Society descend.

RAS, INS, EAO, etc. - Identification codes developed and used by Al Khamsa,
Inc., for the various historical studs in Egypt. see Al Khamsa Arabians II, p. 139,
for a complete list. RAS = Royal Agricultural Society     INS = Inshass (also IOHB -
Inshass Original Herd Book)     EAO = Egyptian Agricultural Organization     MNL=
Manial Stud of Egypt     AP= Abbas Pasha