Tantra Sāra 1.028

शङ्खचक्रगदापद्मधराश्चैते हि सर्वशः। क्रमव्युत्क्रमपद्मादि गदादिव्युत्क्रमस्तथा। अर्धक्रमः सान्तरश्च षट्सु षट्स्वरिपूर्विणाम् ॥२८॥

śaṅkhacakragadāpadmadharāścaitē hi sarvaśaḥ। kramavyutkramapadmādi gadādivyutkramastathā। ardhakramaḥ sāntaraśca ṣaṭsu ṣaṭsvaripūrviṇām ॥28॥

śaṅkhacakragadāpadmadharāścaitē = they are all carrying conches, discs, clubs, and lotuses; hi = certainly; sarvaśaḥ = always; kramavyutkramapadmādi = in order and in reverse order the lotus; gadādivyutkramastathā = then the club in reverse order; ardhakramaḥ = the half order; sāntaraśca = then the order in intervals; ṣaṭsu ṣaṭsvaripūrviṇām = in six of the six preceding six vowels;]

They are all (24 forms) carrying conches, discs, clubs, and lotuses always. They are holding lotus in order and then in reverse order, then the club in reverse order, then in half order, then in intervals, grouped in six of the six preceding six vowels.

Note:

A pictorial representation of 24 forms is the order described: