This is an ?okina: ?
- Unicode U+02BB
These are characters using a kahak?: ? ? ? ? ?
- lower case
a
with macron: Unicode U+0101 - lower case
e
with macron: Unicode U+0113 - lower case
i
with macron: Unicode U+012B - lower case
o
with macron: Unicode U+014D - lower case
a
with macron: Unicode U+016B