aṣṭādaśa dhātavaḥ

Sanskrit: अष्टादशधातवः aṣṭādaśadhātavaḥ
Pāli: अट्ठारसधातुयो aṭṭhārasadhātuyo
Tibetan:ཁམས་བཅུ་བརྒྱད་ཀྱི་མིང་ལ་khams bcu brgyad kyi ming la
Thai: ธาตุ 18
English: 18 elements

Grammatical information:
This is a "dvigu" compound(samāsa) with aṣṭādaśa(eighteen) + dhātu as āyatanāni (vocative - masculine - plural)

Further information:

viṣayadhātu(object element)	indriyadhātu(domination element)	vijñanadhātu(consciousness element)
rūpa (form)	cakṣu (eye)	cakṣu (eye)
śabda (sound)	śrotra (ear)	śrotra (ear)
gandha (smell)	ghrāṇa (nose)	ghrāṇa (nose)
rasa (taste)	jihvā (tongue)	jihvā (tongue/tasting)
sparśa (tactile)	kāya (body)	kāya (body/tactile)
dharma (mind)	mana (mana*)	mana (mind)

For the first 5 indriya, there are corresponding dharmas</a> of “form-clarity” (rūpa-prasāda) in our body, a derivative type of form that can function as the basis(āśraya - the support) for the arising of consciousness.

According to Abhidharma, mind object(dharmadhātu) and mind consciousness(mana-vijñāna / manovijñāna) do not involve mana-indriya(mana-dhātu / manodhātu) for the arising of cognition. *The mana-dhātu or manodhātu can manifest as object element(viṣayadhātu)based on the former moment of cognition (of any of the 6 types). Hence, cognition can arise from manodhātu and mindconsciousness(mana-vijñāna / manovijñāna) as well.