symbol= "ῇ̣"
print(len(symbol))
>>>>2

# -*- coding: utf-8 -*-
import csv
from alphabet_detector import AlphabetDetector
ad = AlphabetDetector()
with open("tbltext.csv", "r", encoding="utf8") as txt:
    data = csv.reader(txt)
    for row in data:
        text = row[1]
        ### Here I have some string manipulation (lowering everything, replacing the predefined set of strings by equal-length '-',...)
        ###then I use the ad-module to detect the language by looping over my characters, this is where it goes wrong.
        for letter in text:
            lang = ad.detect_alphabet(letter)

>>>
>>> word = "ἐ̣ν̣τ̣ῇ̣[αὐτ]ῇ"
>>> for letter in word:
...     print(letter)
...
ἐ
̣
ν
̣
τ
̣
ῇ
̣
[
α
ὐ
τ
]
ῇ