The word Sindhi has multiple meanings. It derives from the name of the River Sindh, which is also called Sindhu, Indus, Mehran, and many other names.
The valley that Sindhu river passes through is called Sindh. Sindh is currently a province of Pakistan. People of Sindh are called Sindhi, and their langauge is also called Sindhi. Sindh used to be larger than its current political boundaries. During the partition of India in 1947, Sindh was divided as well. Mumbai (Bombay) in current India used to be part of greater Sindh.

Persians sometimes interchange S with H, and they called Sindh as Hind. As some european languages cannot pronounce H, it became Ind plus "us" for romanisation, making it Indus, and later on India.

Historically, Sindh being the gateway to the entire Indian sub-continent for persian, arab, and european invaders, gave its name to the entire area.
The word Hindu basically means someone from Hind (Sindh). It never represented a religion as it does now. What it represented was the ways and traditions of the people of Sindh. With the foreign invasions came many religions, for example arabs brought Islam. Those who accepted Islam called themselves muslims. Those who did not accept the new religions started to be called Sindhus or Hindus, and this gave the word a religious meaning - not as of belonging to a religion, but as of not belonging to the new religions. Today the collective traditions of those who did not accept the new religions are labelled as Hinduism and taken as a religion.

The Indus Civilisation is one of the oldest known advanced cultures.

I am a native speaker of Sindhi language, spoken by about 17 million people in current Pakistan, and 2.5 million in current India. Sindh was divided in two parts 1947 during partition of India based on religious and political grounds, which resulted in violence and cross border migration, with majority of Hindu Sindhis migrating to India, and Muslim Sindhis to new Pakistan. Sindhi language has been written in several different scripts in different periods.

Sindhis in Pakistan now write in Perso-Arabic script, which has a varying number of letters in the alphabet, depending on how one counts it. Children in schools are taught that the alphabet has 52 letters, but essentially they are taught more than 52 - a small letter, a phonetic combination of two letter, and 6 accents makes it to 60. The language has a large number of consonants, that are not present in other languages, and in general cannot be pronounced properly by non-natives who learn them as adults.

Sindhis in India write in Devanagri script (based on Sanskrit script), which has 51 letters in the alphabet, and some accents/vowels that I cannot count as I'm not fluent in it.

Sindhi was also written formerly in Sindhi script, which is now called Khudawadi script, and has 61 letters.

Sindhi can be written in any of these scripts without losing or gaining any additional phonetic information, or more importantly the meaning of any words or sentences, i.e. if someone was reading it out loud, I will not be able to tell what script they were reading. Perhaps I could tell if I could see their eyes, because Perso-Arabic script is written Right-to-Left and Devanagri is written Left-to-Right like English, but that does not change the meaning of what is being read, whatsoever.

Many years ago, I developed a keyboard layout for Sindhi (and Urdu), and strictly speaking, the Perso-Arabic alphabet is much more extensive as some letters must have three different forms, depending on their position in a word (initial, terminal, or in the middle), and if they are adjacent to certain other characters

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