What kind of alphabets and symbols can be used?

Only the 26 letter Latin alphabet a, b, c, d, e, f, g, h, I, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z can be used for species names (Art. 11.2). Generally the spelling used in the original description is followed (Art. 32). However accents or other marks, e.g. “é”, “ø” are corrected, gaps apostrophes and hyphens (except rare instances) are removed and numbers spelled out in letters (Art. 32.5.2).