26-letter case: Aa, Bb, Cc, Dd, Ee, Ff, Gg, Hh, Ii, Jj, Kk, Ll, Mm, Nn, Oo, Pp, Qq, Rr, Ss, Tt, Uu, Vv, Ww, Xx, Yy, Zz.

Source e (capital); E (lowercase) is the fifth letter in Latin letters and English letters. It comes from a Greek letter epsilon (ε, ε) with similar shape and function. Hê in Semitic language may be the first word to express function or address people. In Semitic, the letter /h/ (in other languages, it can be /e/), and in Greek, hê becomes εεελνν(Epsilon)attack/e/.

"Capital e" refers to the unknown in mathematics, the energy symbol in physics, the expected value in statistics, etc. "lowercase e" is the abbreviation of electronic, and it is also a network term. E is a syllable in the international British standard.