Linear A fragment from Phaistos with a fish remarkably resembling the ancient Christian-like iconography of the fish:

Phaistos Linear A tablet with fish Christian-like iconography

This Linear A fragment from Phaistos, which was found in the same cache as PH 7, is remarkable insofar as we find on it the sole occurrence of the ideogram for fishon any Linear A tablet anywhere, regardless of provenance.

This symbol is remarkable for two reasons. First, it is clearly a reflection of the inscription on Phaistos fragment PH 7, which reads as follows, “(illumined by) the firebrand of the goddess of healing, the bread of healing with water from a cup”. If this is not reminiscent of the Christian communion, I do not know what is. But we can go even further. The resemblance between the fish ideogram on this Linear A fragment from Phaistos to the fragment bearing an anchor, fish and Greek chi ro symbols from the Catacombs of Saint Sebastian

chi-rho fish anchor fragment from catacombs of saint sebastian

is so striking that one is left wondering how this can possibly be. However, there may be less of a mystery here than we might otherwise imagine. It is a well known historical phenomenon in ancient religions that a later religion frequently borrows its iconography from a former.

Additional critical  highly relevant commentary by Daniel Rocha:

It is true that later religions borrow from older religions, but it seems that these symbols kind of run in parallel to Judaism, as far as I know. In any case, the symbols you are mentioning are linked to the worship of Atargatis. This deity used to be the wife of God in the very primitive versions of Judaism. If what you are pointing is true, it seems that the worship of Mary is justified, since she would be the wife of God. But, as far as I know, this cult among Jews did not exist in the 1st century CE.

But look here: “It has also been proposed that the element -gatis may relate to the Greek gados “fish”.[14] (For example, the Greek name for “sea monster” or “whale” is the cognate term ketos. So Atar-Gatis may simply mean “the fish-goddess Atar”.”

https://en.wikipedia.org/wiki/Ichthys

https://en.wikipedia.org/wiki/Atargatis

Atargatis

But it could be like gados mana, fish food or something along these lines: https://en.wikipedia.org/wiki/Manna#Origin

Plus an additional comment by Richard Vallance Janke:

The Linear A word keta/kete, which very much appears to be the same word, first in the accusative of aspect (keta) and secondly in the instrumental sing. (kete, meaning “with fish”), of which the masculilne singular in Linear A would have been keto, and which is the equivalent of ancient Greek gados. If this is the case, then the fish ideogram on this fragment from Phaistos echoes even more closely the text of Phaistos PH 7, which as we have already seen is a religious ceremony involving a libation of water along with the bread of healing. If all of this rings true, then the relationship between these two fragments is so striking it simply cannot be ignored. Moreover, the Hebrew, manna (grains, bread), interpreted in Christianity as the bread of Heaven, also appears in Linear A as mana, another astonishing co-incidence.

Richard