G for Grand,or MX depending on what its used for.
Improved Answer:
1000 as a Roman numeral is M
In Roman Numerals one thousand is written as M.
Kilogram or "kg"
It is a kilometre, with symbol km.
It is the number of tens modulo one thousand.
milli or in symbol: m. E.g. mm is millimetre, mA is milliampere.
If it's Roman Numerals then the symbol is M
10^3.
it is "M"
g
The Roman numeral symbol for one thousand four hundred fifty nine is MCDLIX.
1 k
is called type "google.com" the enter vanguard reit symbol, then read or click on one of the several thousand hits