The L on the hill above Lahaina stands for Lahainaluna High School. The L has been there since 1904. The high school is on the same hill, but not nearly as far up as the L.

Lahainaluna means "overlooking Lahaina."
This 30-foot letter "L" at about the 2000-foot level on Mt. Ball, part of the West Maui Mountains,
is created and maintained by the students of Lahainaluna High School by clearing the plants and weeds (and putting in lime to prevent re-growth) on that section of the hillside.
The hike to the L is very difficult, and the trail is now closed to the public.

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