Idantollekha: Indication
Iha: Speculation
Indrasthapana: Which has the shape of India
Indriya: An organ of sense
  Sense organ
Indriyaja: Sensuous
Irya: Care in walking.
Irya-samiti: Care in walking
Iryapatha-kriya: walding carefully, i.e., looking on the ground for protecting living beings which may be trod upon and thus injured.
Isat-pragbhara-bhumi: Slightly bent region, the name of the final abode of the liberated souls [the siddhas]
Ista-devata: Chosen deity
Isvara: God