You may be thinking of the letter combination ghoti. It’s used to point out the strangeness of English spelling and Sex Website pronunciation.

“gh” as in “enough” = F

“o” as in “women” =I

“ti” as in “emotion” =SH

It is NOT an alternate spelling of the word fish.

The homophone for fish is phish, which is an internet term for trying to trick people into giving up valuable personal information. The metaphor is that they are trying to “hook” unsuspecting individuals and exploit their naivety.