The Unicode character U+029A ʚ is named
LATIN SMALL LETTER CLOSED OPEN E.
OPEN? That’s a neat trick.
More seriously, I can see why it’s called that — it’s similar to U+025B ɛ
LATIN SMALL LETTER OPEN E, except that the open part of the glyph has been
closed up. But it still seems fairly odd.
Also of interest is U+025E ɞ
LATIN SMALL LETTER CLOSED REVERSED OPEN E, in
that the order of the applicable adjectives is
CLOSED REVERSED OPEN.
Given that this is a reversed version of a
CLOSED OPEN E, you might expect
it to be a
REVERSED CLOSED OPEN E instead. But it seems to be analysed as
a closed version of U+025C ɜ
LATIN SMALL LETTER REVERSED OPEN E. If
forced to, I’d probably guess that ɜ has been around longer than ɞ.