In the Devanagari script, Anusvar (0902 ं  DEVANAGARI SIGN ANUSVARA) is represented with a dot (bindu) above the letter (मं). Chandravindu (0901 ँ DEVANAGARI SIGN CANDRABINDU) (meaning "moon-dot" in Sanskrit, alternatively spelled candrabindu, chandravindu, candravindu, or chôndrobindu) is a diacritic sign having the form of a dot inside the lower half of a circle. In Standard Hindi, the anusvāra is traditionally defined as representing a nasal consonant homorganic to a following stop, in contrast to the candrabindu (anunāsika), which indicates vowel nasalization. In practice, however, the two are often used interchangeably. But the reason for using it interchangeably is not correct. Use of nasalisation sign ie chandravindu is necessary to avoid any confusion in meaning. हंस-हँस is one of the famous example. Earlier printing days were not as easy as of today in this digital days. So that time making difference in between chandravindu and anusvar was difficult. But time has changed now and so we need to use these properly. If fifth consonant comes with any of the four remaining consonants of the same class, Anusvar is being used. Even all textbooks of NCERT have convention to use both the anusvar and chandravindu in proper ways. Hindi language alphabets and its each chars are of great phonetic importance and so preserving these variations would be necessary. So better we need to use these mark correctl