Reply To: Abbreviation or Symbol
In example 1, each letter stands for something so they would be individually capped. To double cap the string implies that the letter series is an abbreviation for one item.
S and F would need a letter indicator in the key. Only the cap sign is used with the letter in the drawing itself.
In example 2, I agree that the letters H and T would be treated as math expressions unspaced from the operation signs
Dorothy (cl)