Palaso DC [Wingdings]

Palaso DC* typefaces © Tim Liwanag

[*based from Doctrina Cristiana glyphs]
[Palaso is the Tagalog word for 'arrow']

Kudlits suggested by me are:

dash (-)____________ for vowel E
overdot (◌̇)_________ for vowel I
underring (◦)________ for vowel O
underchevron (v)____ for vowel U
triangular colon (ː)___ for repetition
cross (+)___________ for cancelling vowel sound