Given a word like $abbbaaaba$, we can take (say) the first three letters. We might write $$\mathrm{foo}_3(abbbaaaba) = abb,$$ or something like that. Is there any standard terminology or notation here?
2026-03-26 12:36:32.1774528592
Is there standard terminology/notation for the "prefix" of a word?
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prefix (of length $3$) is pretty logical, but I am finding a lot of hits for the second obvious thing that came to mind:
initial segment (of length $3$)
E.g. see this, and this, and this.