Until the mid-1980s, the central two letters signified the armed service, or the branch or category of vehicle.

When the letter signifies an Air Traffic Control Center's area, the assignment will not change if the Center's boundaries are realigned.

Perhaps he would tell us what those two letters signify, and why it has kept a tooth ready for our head cook.

The first letter in the designation now signified the types of trains the locomotive was generally planned to haul:

A letter at the end of this number signifies a special feature, followed by the number of ports (usually 24 or 48) and additional nomenclature indicating other features.

These are names whose first letters signify the position of the defending team's linebackers: strong, middle and weak.

What do the letters signify?

The Greek letter, Phi and Sigma, signify "fellows in science."

The final letters usually signify the numbers from 500 to 900.

We have, indeed, gone through the alphabet, and what a given letter signifies is often confusing.