About the only unit I can think of that it makes sense to describe as a specifically chemical measure is the mole, which is abbreviated mol. You'll notice rather quickly that this is three letters rather than two, so I have no idea what the question could be referring to.
Well, I have ideas, but the problem is that I have many of them. mg, kg, gr, dr, dm, lb, oz ... there are all kinds of abbreviations archaic and otherwise that a chemist MIGHT use (or might, around the 17th century, have used) for units of measurement. The problem is that, except for the aforementioned moles, most of them are not specifically chemical, and it's hard to narrow them down.
If this is from a crossword puzzle, it was almost certainly thrown in because of some awkward construction pairing up a couple of unlikely letters, since it's a terrible clue.
Elements are abbreviated by one or two letters. Most elements are abbreviated by one letter, but some elements are abbreviated by two letters, typically when the one-letter abbreviation is already taken by another element.
The person who created it gets to abbreviate it anything in any language they want. This is one of the glories to being a scientist.
The abbreviation for the state with the capital Helena is MT for Montana.
The symbol on the periodic table means the abrevitation of the chemical element. For example, the chemical element symbol Pm stands for Promethium.
It is refered to as the Elements symbol.
A chemical element's abbreviation is called its atomic symbol. This is typically a one or two-letter representation of the element's name.
The two-letter abbreviation for the Philippines is PH.
The abbreviation for Hawaii is the two letter postal code HI.
Iowa's two-letter abbreviation is IA.
The abbreviation of an element's name is called its chemical symbol, which is a one or two-letter representation used to identify elements in the periodic table. For example, the chemical symbol for oxygen is "O" and for hydrogen is "H."
There is no standard two-letter abbreviation for south. The most commonly used abbreviation for south is "S."
The two-letter abbreviation for the Philippines is PH.
The two-letter abbreviation for Kansas is "KS."
There is not a three letter abbreviation for Kiev. It is a two letter abbreviation which is KV. The abbreviation is typically used when booking airline travel.
AR is the two letter abbreviation for Arkansas.
The two letter standard abbreviation for the state of Vermont is VT.VT is the abbreviation for Vermont.VTVT is the abbreviation for Vermont.
TN is the state abbreviation for Tennessee.