Meter, prosody.
The 26 Meter are Ukta, Atyukta, Madhya, Pratiṣhtha, Supratiṣhtha, Gayatri, Ushnik, Anushtubh, Brihati, Pankti, Trishtubh, Jagati, Atijagati, Shakkari, Atishakkari, Ashti, Atyashti, Dhriti, Atidhriti, Kriti, Prakriti, Akriti, Vikriti, Samkriti, Atikriti, Utkriti.
7 of these are the most common meter, they are also the names of the horses that pull Surya’s Chariot.
Gayatri – 3 lines with 8 syllables each
Ushnik – 3 lines with 8 8 12 syllables
Anushtubh – 4 lines with 8 syllables each
Brihati – 4 lines with 9 syllables each or 8 8 8 12 or 8 8 12 8
Pankti – 4 lines with 10 syllables each or 5 lines wieth 8 syllables each
Trishtubh – 4 lines with 11 syllables each
Jagati – 4 lines with 12 syllables each