The longest inscription found in Harappa contains how many signs?

NCERT (2026-27): “7.2 An enigmatic script … Harappan seals usually have a line of writing, probably containing the name and title of the owner. Scholars have also suggested that the motif (generally an animal) conveyed a meaning to those who could not read. Most inscriptions are short, the longest containing about 26 signs. Although the script remains undeciphered to date, it was evidently not alphabetical (where each sign stands for a vowel or a consonant) as it has just too many signs – somewhere between 375 and 400.…”