"Het" is short for heterozygous and usually reserved for discussing recessive traits.
If you cross a visual recessive animal to one that does not carry that gene you end up with offspring which are 100% "het" meaning they carry one copy with absolute certainty of the recessive gene.
If you cross a 100% het with an animal that does not have the gene the offspring would have a 50% probability of also carrying one copy of the recessive gene. These are commonly referred to as 50% hets.
If you cross 2 animals known to be 100% het for the gene then the offspring have a 25% of expressing the recessive trait and of the remaining 75% that appear to be normals 2/3 have the likelihood of carrying one copy of the gene so, are referred to as 66% heterozygous.
If, through breeding you can verify that a het does indeed carry the gene in question by producing visuals it is no longer considered the 50% or 66% het you bought but, a verified 100% het.
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