इ and ई: Two Ways to Write a Short and Long I
Launch library · evergreen read

इ and ई represent short and long versions of the i sound in Devanagari, much like the short and long अ and आ discussed elsewhere. The two letters look mirror imaged, a small curl facing one way versus a fuller loop the other. As matras, these vowels behave differently in an interesting way: the short इ matra is written before the consonant it modifies.
Even though it is pronounced after, while the long ई matra follows the consonant both in writing and pronunciation. This quirk, sometimes called a reversed vowel, trips up many new readers at first. Practising simple words like कि, ki, and की, kee, side by side helps the eye adjust to this small but important reading habit.
A simple memory aid many learners use is picturing the short इ matra as a small hook reaching backward, physically pulling the reader's eye toward the consonant it belongs to, even though it sits in front of it. Writing both matras several times by hand, side by side, helps the small visual difference between them settle into memory.