# zsh
Eu €
+=d ₫
+=N ₦
+=P ₱
+=t ₮
+K- ₭
+Rs ₨
+Sq ₪
+m/ ₥
+
# useful characters
?! ‽
<3 ♥ # easy alias to trigraph cH-
ac ℀
as ℁
cu ℆ # co ís present though
+=v ⇓
+=! ⇑
# bars and strokes
B/ Ƀ
# turned/inverted (trailing I is uncommon for lowercase, and already used thusly for !I, ?I and NI)
aI ɐ
+cI ɔ # open o
# EI Ǝ # could be confusing, as it's not uppercase schwa eI
eI ə # schwa, not turned E (latter is very uncommon)
FI Ⅎ # not a letter
MI Ɯ
mI ɯ
# nI ᴎ # reversed capital N, but NI already in use
-oI ɔ # can't invert O
rI ɹ
# RI ᴚ # conflicts with RI control char
tI ʇ