Even more, cross-cousins on the mother's side (MBS and MBD) are called by different terms – the same as for M and MB, respectively – than those on the father's side (FBS and FBD). Finally, FB is called by the same term as F,[…] 2009 June 24, Jack David Eller, Cultural Anthropology: Global Forces, Local Lives, Routledge, →ISBN, page 196:
(abbreviation, alt-of, countable, initialism) Initialism of free body diagram.