There are multiple definitions:

1. Federatie Vaktherapeutische Beroepen(Dutch)

   • NVBT, NVDAT, NVDT, NVvMT, NVPMT
   • Organizations (documentation), Therapeutic approaches
   • https://fvb.vaktherapie.nl/

2. Friend leukemia virus B(English)

   • an albino, inbred laboratory mouse strain, derived in 1935 from an outbred Swiss colony at NIH. Named after its susceptibility to this virus. Inbreeding of this line for the Fv1b allele was undertaken in 1970
   • FVB/N, NIH
   • Experimental animal, Transgenic animal
   • https://www.jax…g/strain/001800
   • https://www.pna…/pnas.88.6.2065