Ichthys n. : Same as Ichthus.

Example:
How was the acrostic of the Ichthys found out?

Taxonomy
fish, symbol, Parodies of the ichthys symbol, fish symbol, Christian, Christian symbol, Greek, Jesus, early Christians, Ichthus, first letter, Jesus fish, arcs, coin, free encyclopedia, Bumper sticker, adaptation, Theou.

Defination from the web:
Ichthys or Ikhthus (Greek: ἰχθύς, capitalized ΙΧΘΥΣ or ΙΧΘΥC) is the ancient and classical Greek word for "fish. ... From this time the display of the ichthys symbol, sometimes in combination with an Aquarius Festival sticker in the rear window of Kombi vans became common. ...