Actually, I believe the official Lojbanic compass looks like this:
B
V + D
N
See {be'a}, {du'a}, {ne'u} and {vu'a}.
IIRC, these were specifically chosen to have different first letters
(which meant not just deriving them from the corresponding gismu) so
they could be used on compasses.
mu'o mi'e maten.
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