A locus is the position of a gene on a chromosome.
As part of a sequence, a locus has both predecessor and successor (either of which, as in any sequence, can be null).
When talking about, say, a linked list, I find it more elegant and concise to say the locus of the list iterator rather than the node to which list iterator is currently pointing.
Commenters have pointed out the hazards of borrowing an overloaded term like locus; if you want to use a more standard term, current element is well-understood.
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