ㄞ = ai
ㄞ is a final: the vowel part at the end of a syllable. In pinyin it is written ai.
Pinyin aiIPA /ai/Final · Compound finals3 strokes

How to say it
Glide from ㄚ to ㄧ: “eye”.
Do not mix up
ㄞ starts wide open (ah-ee); ㄟ starts half open (eh-ee). See ㄟ (ei) →
Stroke order, step by step
Stroke order from Taiwan’s Ministry of Education. The dot shows where the new stroke starts.
Words with ㄞ
愛
ㄞˋ
ài · to love; to like · TOCFL Novice 2
台北
ㄊㄞˊ ㄅㄟˇ
tái běi · Taipei
台灣
ㄊㄞˊ ㄨㄢ
tái wān · Taiwan; Formosa · TOCFL Novice 1
現在
ㄒㄧㄢˋ ㄗㄞˋ
xiàn zài · now; right now · TOCFL Novice 1
百
ㄅㄞˇ
bǎi · hundred; many · TOCFL Novice 1
小孩
ㄒㄧㄠˇ ㄏㄞˊ
xiǎo hái · child; kid · TOCFL Novice 1
21 syllables with ㄞ
Make ㄞ glow.
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