What is the meaning of ∅-?

A representation of the zero prefix.

A classifier suffix with no obvious function

Marks a third person singular subject; he/she/it

Represents an unmarked or null gender on all nouns that do not fall into the d-gender, ko-gender, or n-gender. These nouns include a wide variety of animate and inanimate nouns.

A zero prefix that is the third person singular, and second person singular, dual and plural agent marker.

One of four classifier prefixes appearing on all Dena'ina verbs. The ∅-classifier appears primarily in intransitive verbs.

One of four classifier prefixes mandatory on all Lower Tanana verbs. The ∅-classifier appears primarily in intransitive verbs, but also on some transitive verbs.

the ∅- classifier (valence-change prefix), which is the absence of a prefix and usually marks an active verb as intransitive

represents a third-person singular subject, which does not have any explicit marking on Navajo verbs.

Source: wiktionary.org