Meaning of (अवतल ग्रेटिंग) avatal greting in english

Other :
concave grating
Exampleअवतल ग्रेटिंग का हिन्दी मे अर्थ

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(अवतल ग्रेटिंग) avatal greting No of characters: 13 including vowels consonants matras. Transliteration : avatala greTi.nga

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