Diophantine approximation deals with approximation to real numbers by rational numbers. The symbol "≈" means "approximately equal to"; tilde (~) and the Libra sign () are common alternatives.
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what is symbol table in computer
The above is the symbol of flow meter.
The circle and line symbol that appears on most computer power buttons is simply the symbol for Power. This is a universal symbol and it used on computers in many countries. It is considered the universal symbol for Power On/Off.
It allows the symbol to be placed in a Process box fashion, with Inputs (2, 6 and 7) on the left, power and resets in the middle (1, 4, 5, 8) and outputs on the right (3). That way you won't have tracks having to go around the houses.
THE SYMBOL FOR Flow Meter is : FI as Flow Indicator