Q: describing how one reads text

[Joel S. Berson]

Is there a word to describe how one's eye moves when reading
(Occidental) text -- horizontally along the line, then down one line
and back to the starting edge?

I have a very faint recollection of a word that applies to text where
one went one line down but continued reading from the edge that was
the end of the preceding line (that is, left to right, then right to
left, etc.) -- but it's so faint that all I seem to remember is that
it began with a "b".

Joel

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