Try using something with proper Unicode support, such as Python:

$ python3 -c 'import sys; print("\n".join(set(c for l in sys.stdin.readlines() for c in l.split())))' < bar
⊙
☯
'
ᵒ
⊕
½
.
✖
☜
❊
๑
ᴗ
♨
O
۩
☎
☏
o
‿
۞
☞
ღ
Θ
*
◕
ɔ
♋
❂
♬
◎
$ python3 -c 'import sys; print(len(set(c for l in sys.stdin.readlines() for c in l.split())))' < bar
30

Try using something with proper Unicode support, such as Python:

$ python3 -c 'import sys; print("\n".join(sorted(set(c for l in sys.stdin.readlines() for c in l.split()))))' < bar
'
*
.
O
o
½
ɔ
Θ
۞
۩
๑
ღ
ᴗ
ᵒ
‿
⊕
⊙
◎
◕
☎
☏
☜
☞
☯
♋
♨
♬
✖
❂
❊
$ python3 -c 'import sys; print(len(set(c for l in sys.stdin.readlines() for c in l.split())))' < bar
30