The phone does a decent job at guessing what word you're going to type next, then displays it over the first letter of that word. (canadianbusiness.com)
For instance, take the first letter of each word in the phrase Jane Smith's Salesforce login is password. (inc.com)
The early Christians worshipping in the catacombs had the fish as their symbol because ichthas, the Greek word for fish, was what they got when they took the first letters of the words, «Jesus Christ, the Son of God, the Savior.» (religion-online.org)