For the ORFeome collaboration, what do OCAA, OCAB, OCAC and OCAF mean?

These are plate names within the ORFeome Collaboration Collection.
The human full open reading frame set in 96-well format: the OCAA (kanamycin-resistant) and OCAB (spectinomycin-resistant) rearrays consist of Gateway entry clones containing the full open reading frame (ORF) of a gene.
OCAC are mouse clones with spectinomycin resistance, and OCAF are Danio rerio clones with kanamycin resistance. see links:
http://www.imageconsortium.org/?p=25#resources http://www.orfeomecollaboration.org/About