Tav) (Esther 9:29) "And Esther wrote (tikhtav)" - the first tav is big, because she said, "Write me for [all] the generations." (See Megillah 7a; Otzar Yisrael, Large and Small Letters.)
The Midrashim Rabbinic Interpretive Commentary of Rabbi Akiba on
Midrashim of Rabbi Akiba, The Enlarged Letters