It appears that the body of the syena is quadrangular Caturaśra Śyena, or "four-sided falcon." (Mānava Śulbasūtra):
Archiecture of Ellora Kailāsa mandiram is also Caturaśra, consistent with Veda tradition.
Objective of śyena citi is heaven. The Veda metaphor is that worshipper and his wife mount the caṣāla to attain heaven. Yajña, मेधा , intelligence , knowledge , understanding is also = धन Naigh. ii , 10 in the context of Indus Script metaphorical rebus renderings.
The evidence is emphatic that Indus Script is a Veda cultural continuum.Here are two seals which are representative; they seal the Indus Script narrative in over 8000 inscriptions. The thunderbolt maker is آهن ګر āhan gar, s.m. (5th) A smith, a blacksmith (Pashto). Hence, gaṇḍabheruṇḍa idiom of the historical tradition continuum from Veda metaphors.
Thunderbolt, vajra
See:Homa bird, श्येन śyena, sēṇa brings down Soma. Sellers of Mujavata Soma. Indus Script evidences बहुसुवर्णक, bahusuvarṇaka Soma Samsthā yāga. https://tinyurl.com/
Harappa seal h166A, h166B. Vats, 1940, Excavations in Harappa, Vol. II, Calcutta: Pl. XCI. 255
फडा (p. 313) phaḍā f (फटा S) The hood of Coluber Nága &c. Ta. patam cobra's hood. Ma. paṭam id. Ka. peḍe id. Te. paḍaga id. Go. (S.) paṛge, (Mu.) baṛak, (Ma.) baṛki, (F-H.) biṛki hood of serpent (Voc. 2154). / Turner, CDIAL, no. 9040, Skt. (s)phaṭa-, sphaṭā- a serpent's expanded hood, Pkt. phaḍā- id. For IE etymology, see Burrow, The Problem of Shwa in Sanskrit, p. 45.(DEDR 47) Rebus: phaḍa फड ‘ manufactory, company, guild, public office’, keeper of all accounts, registers.
dhanga 'mountain range' Rebus: dhangar 'blacksmith'
kanda.’fire-altar’.khamba ‘ wing’ rebus: kammaTa ‘mint’. gaṇḍa ‘four’ Rebus: khaṇḍa ‘metal implements. Together with cognate ancu ‘iron’ the message is: native metal implements mint.
श्येन [p= 1095,2] m. a hawk , falcon , eagle , any bird of prey (esp. the eagle that brings down सोम to man) RV. &c; firewood laid in the shape of an eagle Śulbas. (Monier-Williams) śyēná m. ʻ hawk, falcon, eagle ʼ RV. Pa. sēna -- , °aka -- m. ʻ hawk ʼ, Pk. sēṇa -- m.; WPah.bhad. śeṇ ʻ kite ʼ; A. xen ʻ falcon, hawk ʼ, Or. seṇā, H. sen, sẽ m., M. śen m., śenī f. (< MIA. *senna -- ); Si. sen ʻ falcon, eagle, kite ʼ.(CDIAL 12674) Rebus: sena 'thunderbolt' (Sinhala):
Homa bird, श्येन śyena, sēṇa brings down Soma. Sellers of Mujavata Soma. Indus Script evidences बहुसुवर्णक, bahusuvarṇaka Soma Samsthā yāga. https://tinyurl.com/ yb72o7za

फडा (p. 313) phaḍā f (फटा S) The hood of Coluber Nága &c. Ta. patam cobra's hood. Ma. paṭam id. Ka. peḍe
dhanga 'mountain range' Rebus: dhangar 'blacksmith'
Ta. eruvai a kind of kite whose head is white and whose body is brown; eagle. Ma. eruva eagle, kite.(DEDR 818). Rebus: eruvai ‘copper’ (Tamil).
eṟaka ‘wing’ (Telugu) Rebus: erako ‘molten cast’ (Tulu) loa ‘ficus’; rebus: loh ‘copper’. Pajhar ‘eagle’; rebus: pasra ‘smithy’.
kanda.’fire-altar’.khamba ‘
श्येन [p= 1095,2] m. a hawk , falcon , eagle , any bird of prey (esp. the eagle that brings down सोम to man) RV. &c; firewood laid in the shape of an eagle Śulbas. (Monier-Williams) śyēná m. ʻ hawk, falcon, eagle ʼ RV. Pa. sēna -- , °aka -- m. ʻ hawk ʼ, Pk. sēṇa -- m.; WPah.bhad. śeṇ ʻ kite ʼ; A. xen ʻ falcon, hawk ʼ, Or. seṇā, H. sen, sẽ m., M. śen m., śenī f. (< MIA. *senna -- ); Si. sen ʻ falcon, eagle, kite ʼ.(CDIAL 12674) Rebus: sena 'thunderbolt' (Sinhala):